incorrect display of Icloud storage on MacBook Pro

basically what the screenshots says, my 50gb Icloud drive has about 20gb of free space, meanwhile on Mac it says it actually weights around 140gb. any idea why that might. be? I should add that ive been copying some files back and forth to and from my Mac and as of right now there is nothing more then what should be there. also I have erased around 140gb of videos that got caught up in the system somehow as applications using omnidisk, those were the ones I was moving from one usb stick to another. have been windows user since forever and still am, although I do have MacBook and not knowing what's going on is driving my crazy. any thoughts ?