Hey Rex!
Ahhh, I see what you mean. I think as opposed to a bug, it's just very very confusing UI.
When you've added a step after the AI Agent, there is a 'built-in' AI Agent. However, if looks like you've added an extra exit condition ontop of the built-in one. Clicking the 'Add Exit Condition' is to add an extra exit condition ontop of the built in one.
In order to fix this, you can delete the extra one, click on the 'Define a Condition' path and update the wording in that one.
I'm going to send this feedback over to the team as there is improvements that can be made