traffic-group has failover object that doesn't exist in "Virtual Servers" tab

Hello dude,

This is what I can tell to you:

What you are seeing is the virtual address and not the virtual server. So, one or more virtual servers may share the same address e.g. x.x.x.145:80, x.x.x.145:433.

I think that may be that this address became orphan when a virtual server was deleted or is still being used in another partition that you have not seen yet. If you are working with partitions and is allowed to see them or just want to know if it address is used, you could just try to delete it or do something like below to find in all system:

tmsh
cd /
list ltm virtual recursive one-line |grep "x.x.x.145"

Regards.