Hi Jakub, 

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> Storage Used.

In the future, if you experience incorrect storage, please let us know in this forum.

Thanks for posting!

@Rona, Would you please review my account and see if I have this problem as well?  From my calculations, the "Storage Used" is off by almost 20GB.