Sorry, it is really difficult to adequately describe what is happening, but it’s been going on for a bit over a week now. It’s pretty annoying. This is on iOS (iPhone 8) version 13.6, v18.104.22.16845.
Basically, I finish studying one deck in my list (e.g. - JLPT N3) and exit this deck, tap another deck (e.g. - JLPT N2) to start reviewing/learning that one. However, unlike normal I am instead directed to the previous deck’s page (e.g. - instead of going to JLPT N2 deck which I tapped/selected, I am sent back to the JLPT N3 deck’s homepage). Often I don’t notice until I tap the review/learn new words button and I realise I’m still on the deck I was previously studying. The deck that I tried to enter now appears second on the list. Sometimes I have to enter/exit the deck several times before I finally get directed to the deck I want to study’s homepage. This is most noticeable across languages (e.g. - JLPT N3 to Mongolian 1), however that might just be a coincidence. It doesn’t happen every single time, perhaps half the time I can change between decks without issue.
Sorry, as I said, describing exactly what is happening is very difficult to articulate, but if other people are having a similar issue they may be able to explain it better.
Thank you for your time.