I tried once again on AnkiDroid but I couldn’t reproduce this even though I followed the same exact steps.
Yeah, in the meantime I will try to get a screengrab of what I was doing.
Note for others who may wish to reproduce this:
Follow what I did here. I created a deck named Test; added some three cards with only front. Deck Options had 2s 10s as learning steps which I changed midway (2s 5s).