Please deactivate all the plugins not related to the theme and switch the parent theme, check the issue, If the problem has gone, activate the plugins one by one, checking the issue to detect which one causes the problem.
if the problem remains, even after the plugins deactivated leave the plugins to deactivated for us to check and provide your site admin access to the private area.
If you cannot keep the site without the plugins confirm the permit for us to deactivate them for the while of checking what may take up to 15 minutes.
Actually have not more plugins installed, except yoastseo and MonsterInsights.I did not know that it could not work with these so ispresdincible plugins.
Anyway I have disabled both and now it works fine.
The problem is that now I need seo and webanalytic plugin, which plugin is compatible with the theme?