I resized the page to make it wee bit wider that fixed the problem. Apparently when the overlapping first column forced to go to the second column on my original browser size setting.

Oh, by the way I'm using the Microsoft Edge Chromium Version 131.0.2903.112 (Official build) (64-bit).

There is already a note about that.
And the more notes I put the higher is the risk of not reading notes
If we make the remark to a user, he should understand and do it the next time, no?
I can't detect if the image is drastically different or not (well there are probably ways to do that, I don't know what would be the cost for that and the time needed though).

edit: the note says:

I'll add a precision about putting the old one in comments, but as I said it is something we can say to the contributors: normally those who replace pictures are more used to imcdb than the average new users.

edit2: the new note is:

Ctrl+F5 refreshes all files (images, style sheets, etc.), that's a little heavy juste to force the browser to reload the page, a simple F5 should be enough, but even that should not be needed: he should be able to render that list on its first try.
Otherwise try resizing a little the page to force it to redraw the list?
I had no issue with that page in Firefox, I have not much tested in Edge, but it seemed to work.

Apparently the <Ctrl>-F5> refresh did not work now

https://imcdb.org/makes.php

Antp is there any way to encourage contributors to add the old main image as a thumbnail when they drastically change the main image?

I am trying to help validate for night cub and walter and I have run into this in both movies I validated.

I wasn’t sure if there was a warning or possibly some alert when changing the main image to a totally different frame?

Thanks to dhill_cb7's tip. I just used the <ctrl>-<F5> keyboard combination to refresh the page and that resolved the problem.

Overlap happens for me as well when I click my bookmark in Safari. I just refresh my browser page and the overlap goes away.

Not sure if my bookmark is old but a quick refresh works for me.

Minor change: now when editing or deleting a comment you are directly redirected to the source page, instead of having to click on the "Back" link on the page saying that the operation was successful.

Yes it is probably while loading the page, as the list is very long the browser takes some time to do the rendering of the needed number of columns.
Before it was made with a table and fixed columns.

It did that for me too while the list loads but it quickly turns to normal (Chrome both on Android phone and PC).