Pretty sure the BGP neighbours are reported directly from the device's SNMP agent.
Chek this by polling the BGPpeerTable (126.96.36.199.188.8.131.52).
You may need to remove the entries from your database (assuming that that haven't already aged out).
Using the link above, follow these instructions (instead of removing duplicate you are removing old entires). I've had to do this a few times in the past.