Hello,
No, this is not weird e-mail, it's email sent by our server. The thing is that you provided different e-mail addresses on the forum and in the billing. This is not correct. You need to change your data on the forum so that e-mail addresses were identical and restore your e-mail address on the forum so that it is the same as in the billing. Recover your data and make them identical both on the forum and in the billing.
Regards