Site breaking down occasionally and pasting plugin texts on page html itself

okay, so I noticed that from incognito, I did still see the issue, even after Ctrl+F5 and cache cleaning on both sides.

So I tried to change the Theme to Twenty Twenty-Five and it removed the text from the html body.
I moved back to our child theme based on WoodMart – and the texts came straight back on the incognito user.

Now, this time the text seems to be related to the plugin that updates stocks on our site [ if something sold in shop, site updates as well ].
Previous time it was the WordFence, and before that it was the stock notifier plugin.
Also, this time when it happened – the Elementor was GONE on our site. Had to rollback…

Anyway, seems like part of the problem still persists and can be seen. Seems it does have a connection to the theme [ or at least files used with the theme ].

current text we get:
componentsCounter = 0, fusionUsedComponents = [], // eslint-disable-line no-unused-vars postContent = jQuery( '#content' ).text(); // eslint-disable-line no-unused-vars // Loop over all available elements and add them to Avada Builder. sortedElements = _.sortBy( fusionAllElements, function( element ) { return element.name.toLowerCase(); } ); _.each( sortedElements, function( element ) { var newElement, targetObject = fusionGeneratorElements; if ( 'undefined' === typeof element.hide_from_builder ) { newElement = { title: element.name, label: element.shortcode }; if ( 'undefined' !== typeof element.component && element.component ) { targetObject = fusionComponents; } if ( 'undefined' !== typeof element.allow_in_form && element.allow_in_form ) { fusionFormComponents.push( newElement ); } if ( 'undefined' !== typeof element.form_component && element.form_component ) { fusionFormComponents.push( newElement ); return; } if ( 'undefined' === typeof element.generator_only && 'undefined' === typeof element.form_component ) { fusionElements.push( newElement ); } targetObject.push( Object.assign( {}, newElement, { generator_only: 'undefined' !== typeof element.generator_only ? true : element.generator_only, templates: 'undefined' !== typeof element.templates ? element.templates : false, components_per_template: 'undefined' !== typeof element.components_per_template ? element.components_per_template : false, template_tooltip: 'undefined' !== typeof element.template_tooltip ? element.template_tooltip : false } ) ); } } ); // Filter compoments. fusionComponents.forEach( function( component ) { if ( 'string' === typeof fusionBuilderConfig.template_category && ( 'object' !== typeof component.templates || component.templates.includes( fusionBuilderConfig.template_category ) ) ) { componentsCounter++; } } ); FusionPageBuilder.ViewManager = Backbone.Model.extend( { defaults: { modules: fusionElements, generator_elements: fusionGeneratorElements, components: fusionComponents, componentsCounter: componentsCounter, elementCount: 0, form_components: fusionFormComponents, views: {} }, getView: function( cid ) { return this.get( 'views' )[ cid ]; }, getChildViews: function( parentID ) { var views = this.get( 'views' ), childViews = {}; _.each( views, function( view, key ) { if ( parentID === view.model.attributes.parent ) { childViews[ key ] = view; } } ); return childViews; }, generateCid: function() { var elementCount = this.get( 'elementCount' ) + 1; this.set( { elementCount: elementCount } ); return elementCount; }, addView: function( cid, view ) { var views = this.get( 'views' ); views[ cid ] = view; this.set( { views: views } ); }, removeView: function( cid ) { var views = this.get( 'views' ), updatedViews = {}; _.each( views, function( value, key ) { if ( key != cid ) { // jshint ignore:line updatedViews[ key ] = value; } } ); this.set( { views: updatedViews } ); }, removeViews: function() { var updatedViews = {}; this.set( { views: updatedViews } ); }, countElementsByType: function( elementType ) { var views = this.get( 'views' ), num = 0; _.each( views, function( view ) { if ( view.model.attributes.element_type === elementType ) { num++; } } ); return num; } } ); window.FusionPageBuilderViewManager = new FusionPageBuilder.ViewManager(); // jshint ignore:line } ); }( jQuery ) )

Any help would be greatly appreciated. Our programmer did not manage to find the root of the issue and it has been like that for more than a month already.

hey, I added login credentials under the first message.
On the staging website you can turn on and off anything you want I think.
it is not in use and was created only to try and show the issue.

The code is not really important I think, since each time we had other codes, from different plugins.
The one thing I did see, is that in each occasion, the functions.php was re-written with the same code that pops up on the html.

I mean, the code showing up is connected to the issue, but the codes are different each time and are coming from different plugins each time [ we had elementor codes the first time it happend, we had wp-import codes, which is the fusion we see now if I am not mistaken, we had codes from WordFence … everytime it takes a part of code of one of the plugins and pushes it into the html.

You are welcome to do anything, turn off and on what ever you think might help to find the issue.
I just hope we can fix it asap and that the fix won’t make us forego something important