Gigantic ghost files

[AC Question]

So i have a motorola moto g, sadly doesn't have an sd card slot. but i've run into a problem where i run out of storage really quickly and i have a very small amount of apps. So I look in my storage and it says that i have about 500 mb available but the bar chart shows that i should have about 1-2 gigs available. I don't know whats going on and it's getting really annoying. I only have Instagram, messenger, crunchyroll and my bank app, those are the only downloaded ones.