Why the fuck did you use such a decent IG like that for checking? Ive always suggested, and prompted everyone to use fresh IG's only to prevent something like this from ever happening. I'm sorry you lost the IG, but it is not my fault that this happened.
The checker goes down the list and attempts to claim each name. If it finds one as available, It claims it. It then asks you though if you would like to claim/keep the name. If you say no it reverts it back to the name of the account you used to login with.
I apologize if I didn't make it 100% clear that fresh IG's were the most suggested IG's to sign in with. I tbh, didn't think anybody would even risk it on such a decent IG. lol