OneDrive downloads all files just uploaded

Mike, to give some more clarity. Our company has used Dropbox for several years. We access our files primarily through our external drives. We sync our files via the app both to the cloud and also to our drives. Our company also uses SharePoint and OneDrive and in the last few years we have seen a push to use this and not Dropbox. In the case we do pull the trigger on this at some point (we are not currently because of a minor detail) I have copied all of our files from Dropbox to OneDrive which can also be accessed on our SharePoint site. Our primary setup is through Dropbox, but I want to keep the files on OneDrive up to date in the case we do move over to it. For at least the last year I have maintained this setup on a single external 5tb drive. I make sure Dropbox is up to date then I use a file sync program to copy over only the changes to the OneDrive folder. Until recently I was using SyncToy. I stopped using SyncToy because I didn't like the files it was creating in each folder. So I searched for a new program to accomplish syncing the files in the folders from Dropbox to OneDrive using SyncBackFree. It seems to work very well. The only issue I am having now is after syncing the files and loading OneDrive the OneDrive program sees the changes and then uploads the files to the cloud, but then strangely OneDrive then downloads the files it just uploaded which seems to change the file somehow (even though the name and file size is the same as what's in Dropbox) it does something to the files to make the file sync program think they were changed and so it wants to recopy all of the files it just did from Dropbox over to OneDrive. Then it begins this vicious cycle all over again.