Hello,

I have switched to the child theme and deactivated all the plugins not related to the theme: https://prnt.sc/12140oq I am checking and here is how it works now: https://gyazo.com/ea1a41074b35aaeb2e1412a17644e90e no black gaps.

Now I switch to the parent theme and activate the plugins not keep the site without them long.

Please deactivate all the plugins not related to the theme as I show and switch the parent theme, check the gallery, then activate the plugins one by one, checking the issue to detect which one causes the problem.

Best Regards