My Anki software has the following additional card types:
Basic-bda51
Basic-f277f
Cloze-e3c02
What are these card types? They seem to be identical to the basic and cloze card types, respectively. The only add-on I have for is Image Occlusion Enhanced.
You can add new card types by cloning already existing ones. As far as I know, this naming suggests either you or someone else tried doing so and kept the naming as it is. Anki adds random(?) letters to differentiate the new card type.
Yes, this appears to be the reason behind this. I first noticed these strange card types in a deck that I received from someone else. Thank you!