I found the culprit: it is the "display options" box: it is wrongly positioned, pushing all the contents to the left. I'll fix it
edit: done

But the words always stay on the same line before update 🤔. I didn't even change the screen settings or change any options in user page.

That depends on the size of your screen
If there are long model names or long movie titles, they make these columns wider and so less space for other columns.
Maybe I could force these to always stay on one line (except on mobile, where there isn't much space), that would make model & title to wrap faster if needed.

The Model origin section is not displayed properly, three tags should be displayed on the same line.

For example:
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Toyota&model=- Corolla+Altis&page=1
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Toyota&model=- Corolla+Altis&page=4
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Honda&model=A- ccord&page=26

Words in "Class: ***" section also should be displayed on the same line.
https://www.imcdb.org/search.php?resultsStyle=asList&sortBy=0&make=Mercedes-Benz&model=GL

using Firefox 147 too , both on my mom's laptop ( Win10 ) and mine ( stuck with Ubuntu 24 for now , new laptop to be in use in the next days ).

At least I'm not the only one using it

Brave browser

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36

I usually use Chrome. My PC was having issues but later on my laptop I had no issues. Both have been updated recently for Chrome. I haven't had a chance to check the PC again.

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0

I'm on Opera (v95.0.4635.90) on my old Windows 7 laptop - Opera stopped Windows 7 updates some years back so it's fossilised. Have had no real problems today - some sluggishness but no more than what can happen whenever for whatever reason.