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.