In case it helps, iNaturalist won’t make any species guesses for words that are 3 characters or less, so oak.jpg shouldn’t trigger a species guess, but oaks.jpg will add one of Quercus.
I also haven’t encountered this. What we’d need to investigate are:
- filename(s) of the photos
- screenshots of what you’re seeing
- extremely detailed step by step instructions we can follow to try and replicate this on our computers
- browser and browser version