I don't understand your problem.

Please explain the problem in detail. What happens? What is/are the exact error message(s) ?

No error message. I only see the content of my webpages (as you yourself can do going on the link above) shift toward left (maybe 10 pixels or so) within the browser window when I click on any link present in a page. It is annoying...

I see it now. Just under the page header, moving the mouse to open source causes the 'jump.'

I called for more help.

I think that is a css problem, because it arose after a css change: now I use flexbox to center the lateral ads boxes (at left and at righ) in the free lateral space in screen larger than 1024 pixels. Indeed, when a screen is smaller (than 1024px and there are not lateral ads boxes), this problem is not present.

solved: adding a parent div: confronti https://thoughfuldigitalworld.000webhostapp.com/flex+sticky.php.

That was very good work. Well Done. Please flag your last post as Solved Problem as this can help others with similar problems.