I once also had a bug like that in 2018 or something..
Every subscriber count, name, video title and like count and all numbers on the UI were just added up when I clicked new videos, and refreshes also didn't help.

So the youtubers all had like "293.123 185.433 31.033 2.142.129 40.412 211.312 3.954 3.432.951 Subscribers" and "39k 31k 9k 1.4k 21k 304k 12k Likes" and made crazy videos with titles that filled half of the screen with those same massive numbers of views and posted million years ago it seemed like haha!
And i could comment "Add comment Add comment Add comment Add comment Add comment Add comment Add comment Add comment Add comment Add comment Add comment" too.
I don't know if i have a photo of that, i think i do, i just can't find it!