Can anyone experience difference in file and folder size on a large mixed folder?

They were all from single folder and it was when my OS drive was full. It was a folder with so much work files and as I have already moved them to my data drives, the problem seems to be resolved. That means when I am checking the moved folder everything ( Means right clicking on the new folder and clicking properties and selecting all files inside and clicking properties show same size and number of files/folders ) So it may be a temperrory fetching problem related to system resources available at that time. ( Slowness or something. ) But I have seen the same problem lot of times where a bulk folder is copied. At that point of time it makes problem because we have to understand the required space to move to a new folder. That is why I pointed out the problem and I now understand it may be a slowness or resources available problem by which it sometimes show an incomplete result when checking a bulky folder's properties. Thanks for the answer and that is why I checked the new folder again. BUT WHAT I POINTED IS A FACT AT SOME POINTS ESPECIALLY WHEN THERE BARE LARGE FILES AND THE SYSTEM IS A BIT SLOW.HotCakeX