Why does my back and arms hold so much fat?

For starters Im in pretty good shape, not overweight at all. I run twice a day 30 minutes, lift weights, bike, and I can do 30 pushups yet I still hold onto fat in these specific areas. Everywhere else Im thin but this sort of ruins my silhouette in a way. Im on a 1200 calorie deficiency bc I normally take in 1600, Im not sure if im even seeing progress in that area specifically. Im keeping it up but it's so frustrating, I understand I cant spot reduce but I find it weird that theses areas seem to hold everything

submitted by /u/aaaahhatelife
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source https://www.reddit.com/r/loseit/comments/116ueur/why_does_my_back_and_arms_hold_so_much_fat/