Your back template is duplicated thousands of times: It has around 517 thousand lines 
No idea how that happened. I confirmed it’s not coming from AnkiHub thankfully.
Resetting the note type using the AnKing notetypes add-on doesn’t work unfortunately; it actually makes it worse… I’m going to look into that.
You can fix the issue by copying the front/back templates from here, pasting them in the Card Templates screen, and syncing with AnkiWeb:
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