I experience this problem for years.
@MBH: Thanks for reporting this. Please use the bug report form (linked from the top of the task creation page) to create a bug report, and fill in the sections in the template, instead of deleting them. Thanks. Cannot reproduce in Firefox 126. What's in the error console of the browser developer tools, which browsers have you tested and which versions, does this also happen in safemode?
Now it happen on https://ru.wikipedia.org/wiki/%D0%9D%D0%BE%D0%B2%D0%BE-%D0%90%D0%B4%D0%BC%D0%B8%D1%80%D0%B0%D0%BB%D1%82%D0%B5%D0%B9%D1%81%D0%BA%D0%B8%D0%B9_%D0%BA%D0%B0%D0%BD%D0%B0%D0%BB . Console:
Ново-Адмиралтейский_канал:584 This page is using the deprecated ResourceLoader module "codex-search-styles".
[1.43] Use a CodexModule with codexComponents to set your specific components used: https://www.mediawiki.org/wiki/Codex#Using_a_limited_subset_of_components
(анонимная) @ Ново-Адмиралтейский_канал:584
startup.js:1307 This page is using the deprecated ResourceLoader module "jquery.ui".
Please use Codex instead.
execute @ startup.js:1307
VM940:4 Uncaught TypeError: Cannot read properties of undefined (reading 'innerHTML')
at <anonymous>:4:45
at globalEval (startup.js:1134:17)
at runScript (startup.js:1285:6)
at enqueue (startup.js:1172:5)
at execute (startup.js:1392:5)
at doPropagation (startup.js:748:6)
startup.js:1307 This page is using the deprecated ResourceLoader module "mediawiki.ui.button".
[1.41] Please use Codex. See migration guidelines: https://www.mediawiki.org/wiki/Codex/Migrating_from_MediaWiki_UI
execute @ startup.js:1307
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app.js:291 One instance of Convenient Discussions is already running.In safe mode map doesn't work at all: https://ru.wikipedia.org/wiki/%D0%9D%D0%BE%D0%B2%D0%BE-%D0%90%D0%B4%D0%BC%D0%B8%D1%80%D0%B0%D0%BB%D1%82%D0%B5%D0%B9%D1%81%D0%BA%D0%B8%D0%B9_%D0%BA%D0%B0%D0%BD%D0%B0%D0%BB?safemode=1#/maplink/0
Now it happens on https://ru.wikipedia.org/wiki/%D0%96%D0%B8%D0%BB%D0%BE%D0%B9_%D0%BA%D0%BE%D0%BC%D0%BF%D0%BB%D0%B5%D0%BA%D1%81_%D0%B4%D0%BB%D1%8F_%D1%81%D0%BB%D1%83%D0%B6%D0%B0%D1%89%D0%B8%D1%85_%D0%A4%D0%B8%D0%BD%D0%BB%D1%8F%D0%BD%D0%B4%D1%81%D0%BA%D0%BE%D0%B9_%D0%B6%D0%B5%D0%BB%D0%B5%D0%B7%D0%BD%D0%BE%D0%B9_%D0%B4%D0%BE%D1%80%D0%BE%D0%B3%D0%B8
See the screenshot - a string "#/maplink/0" in the end of the URL was removed, but map still overlaps the article.
In safe mode map doesn't work at all:
This seems to be a separate issue, I also reproduce this on en.wp. I'll file a ticket for that (possibly similar to T212645?)
VM940:4 Uncaught TypeError: Cannot read properties of undefined (reading 'innerHTML')
at <anonymous>:4:45 at globalEval (startup.js:1134:17)
This might indicate that a script is trying to replace some content on the page in a non-safe way by using innerHTML.
I see you have quite a few scripts installed https://ru.wikipedia.org/wiki/Участник:MBH/common.js
I'm going to guess that if you blank this page and wait a few minutes, the issue likely is fixed, which would indicate that it is one of the user scripts.
As far as I remember, it occurs without opening another images, but maybe, I don't remember this well.
@Pikne Now it happens definitely without previous opening of an image on page https://ru.wikipedia.org/wiki/%D0%9C%D0%BE%D1%81%D0%BA%D0%BE%D0%B2%D1%81%D0%BA%D0%B8%D0%B9_%D0%B0%D1%8D%D1%80%D0%BE%D0%B2%D0%BE%D0%BA%D0%B7%D0%B0%D0%BB