re-categorizing photos

I've had photos, that I've taken with my cell phone and entered in instagram and mobile, be re-categorized to whatever category they'd have been in if I'd used my DSLR.  Why?  I have a couple of photos that I want to enter now, that were taken with my cell phone, but am hesitant to do so because I do NOT want them re-categorized and competing against actual DSLR photos.  
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