Graph on "main" shows incorrect number of flashcards in box "7+"

[KalvinLightning]

Since around 2024-04-04 the graph on the /main site, which shows how many flashcards are in each box, jumped to around 90000 for the box "7+". There should be only around 1200 for me.
The other numbers are correct and the total amount of flashcards are correct too. I can also review cards like usual. But the graph is difficult to read this way.

I am on mobile using the DuckDuckGo browser and I also tested it with the standard browser and there is the same issue. I have e/OS/ v1.18 and Android 12.

How it looks like:

[fabd]

Could you tell me your username or send me a mail with your username? (cf. contact page). This will make it easier to investigate the bug,

[KalvinLightning]

Yes! My user name is: KanjiKalvin

By the way, I found a workaround to see correct numbers in my mobile view.
When I load the page in wide screen, there is no 7+ column but a 7 and an 8+ column and these two then have correct numbers (I have 8 boxes in total). But when loading the page in the portrait view (like on the screenshot) it's still the ~90k for box 7+.
Edit: And I could replicate it on desktop now. If I load the page in a very narrow browser window, I don't get 7 and 8+ but a 7+ with the ~90k.