@Pyramid5829 Hi and welcome to the community. 
Have you tried leaving the Sync chain on all your devices and just creating a new Sync chain? Is that a problem?
Below is some additional information in a similar topic which may be helpful in understanding the problem.
For whatever reason, if you are unable to leave the sync chain on the devices you still have and create a new sync chain, you should submit a request to support using the form linked below to see if support can manually remove the data. Make sure your include a screenshot of the brave://sync-internals/ page.
@Finishstrong_25 Ditto for you.
Hope this helps!