I fixed the problem. I backed up my QC. I uploaded all of my captures and IR’s etc to the cloud. Reset my QC. Then when I re-synced to the cloud, the QC properly is now displaying the right name on the captures.
Bit late, but I had this issue with my recently-purchased QC - I followed the above methods which didn’t seem to help. However, after changing my name in my profile in the Cortex Control app and hitting unlink and then signing back in again, it seemed to resolve the issue. No more “AbruptBull” or whatever the default username was haha