What to do about my iphone storage saying I'm using up way more photo storage than I actually am?

My storage says I have 132 photos that's using up most of my storage; almost 3 GB. I have only 52 photos and 15 videos in my phone. It seems like it may be using storage from pictures I deleted, but apparently they're still using space?

? Has this happened to anyone else.
I've taken my phone to an apple store, and I didn't get any answers.

Look in your Photo Stream. Delete all the photos in there and then turn it off in settings. If that doesn't help i dunno what will