I joined Stack Exchange with an account on Stack Overflow (for programming) for which I have a desired username (which you can see now). Then I opened an account for BH, and set a different username for that, but wanting to keep my stackoverflow username and it was working. Then yesterday I registered on Chemistry with my account, and it used my BH username (and account details/description.. etc). So, trying to fix that, I somehow set my BH details to the other account details and then I realized this and tried to fix it. Now I can't, because you can only change your username once every 30 days.. ugh.
So, how do I now fix this and prevent this from happening again? How do I get my new associated network accounts to use my Stack Overflow details and keep my BH details intact (and different)?