Hello

You didn’t enter your last name, but the system is still showing your full name with a last name.

This may be due to auto-fill or system default based on previous data or your ID proof. If all your official documents have only your first name, this mismatch could cause problems later. Even after re-registering, the issue remains indicating it's a system-level problem. You should immediately email the IBPS helpdesk with your registration number and valid ID proof to get it corrected.