visibility changed automatically and css not correct for 1 page

I have problems with my website and try to determine what kind of bug this is and what causes this.

1) My global header was suddenly not visible. I had to toggle visibility off and then on to make it visible again.

For 1 page I have 3 issues

a) the title in the global header is without css

b) toggle modules are without css

c) an entire gallery module does not show up.

For all other pages it shows up in the correct way.

For the builder it also shows up the correct way.

I purged the browser cache, cleaned LiteSpeed cache, viewed with 3 browsers incognito but all showed the 1 page wrong.

What kind of bug is this. It might be 2 things/ 2 or more errors caused by several plugins/apps.

I ask this because I want to know what could cause this change visibility settings.