Folder on HDD showing larger than it actually is

I have a 3 TB WD Red, which I have had for around 2 years and it has been working fine, though in these last few weeks I have been experiencing weird issues with my torrent client that downloads to this hard drive. Originally I reinstalled my torrent client but that didn't fix anything, checked all drivers, which were OK and ran chkdsk /f which came back as OK and no bad sectors.

I noticed today that my music folder was seemingly larger than any other folder on the drive, when I check the root folder properties it comes back as the entire folder being larger that 3.6TB which isn't possible considering the drive is only 3TB. When I check the properties of the internal files, it comes back with the correct size of 752GB. Programs like WinDirStat seem to show the data as correct but windows file explorer seems to have an issue with it.

After backing all my data up and reformatting the drive, copying over the back up of my music folder still yields the same results. Though I have found that on my other drive I had backed this particular folder up to, it is registering the folder to be a complete 103TB's on disk, which is completely incorrect. I have run antivirus software and Malwarebytes with no success.

I am really unsure as to what this could be, but it does seem to hinder certain programs I am trying to use.

Any help with this would be greatly appreciated.

If it is any help, the folder structure is as follows:
X:/Music/Downloading/Complete/

The properties of the Music and every other folder give me ambiguous results, unless I check all properties within the "Complete" folder.

The "Complete" folder houses 59,276 Files and 5,083 Folders which equates to roughly 706 GB on disk.

Not sure if this information will help in anyway.

Windows 10 - Version 1803 (OS Build 17134.523)

Thanks Ztruker for your responses to my issue. I have moved the root directory I was having issues with up which resolved the name size limit, seems a bit bizzare that it would cause issues now, as I have had it set in this way for quite a while but nonetheless it has fixed the problem.

I am wondering if it would be the source of the issue causing my torrent client that uses that particular drive to lock up? What do you think?

Torrent files show their completed size after the first piece starts to download. This piece could be as small as 1MB, or whatever the torrent uploader specified.
A completed file would have all parts so a 1GB movie would have show as 1GB. But if you aborted it before it finished, even if you removed the download from your torrent program, the pieces you downloaded still remain on your hard drive, not yet in the "Completed" folder. These would show as 1GB in File Explorer, even if you only had two 1MB parts! If you deleted the uncompleted file from the "downloading" folder, you'd free up 1GB according to File Explorer.
So, check where the torrents download, and delete any torrents you will not be completing.
It also pays to clear the folder where the .torrent files are stored. Unless you're seeding or still downloading, there's no need to keep them.

I have updated to the latest version of windows and haven't experienced any issues as of yet. I believe it was to do with the file name character limit, as after resolving that, the issue seemed to subside. As for the torrent client, all torrents I had were fully completed and seeding on that particular drive I was having issues with. I think maybe the torrent client was locking up because of the file naming structure in a particular folder that was on the drive? But I am only speculating as the issue has not occurred since. I will monitor how I go and post if any other issues arise.