Duplicate records that come from two different models on one index -- how?

[yatahaze]

I've stumbled upon multiple objects in my index that appear to have come from two separate models.

• Two records in the index, both with similar fields, both from separate models, all the matching data filled in for the fields that are the same.
• I've rebuilt entirely a bunch of times. None of this data is leftover from tests.

Can anyone point out to me what I could be doing wrong? I've only got a couple of documents.py files, indexing two unrelated models. I don't know where this error could occur.