This appears to be an issue with out of sync connection scripts. It might be a bug in our product that happens when you have data bridge v1 installed and mySQLi server behaviors when editing an old mySQL version of the search server behavior.
I can't reproduce it since I have DataBridge v2 installed and it might be difficult to reproduce your environment.
I can look into this with you in a screen sharing session. If you are interested, please post a good phone number to reach you in the private area and I'll give you a call.