I'm also having this issue. What's happening?

Welcome to Box Community and glad to help! 

Great news! I went ahead and fixed your storage count. To verify this, log in to box.com> Account Settings> Used Storage.

Should you experience the same issue in the future, please let us know

(https://support.box.com/hc/en-us/articles/360043695334-Storage-Usage-Or-File-Count-In-My-Account-Is-Incorrect).

Thanks for posting!