Yes, I have had this issue also. However, after getting quite annoyed I noticed one branch that I had not selected. I suspect that this is probably the case here also.

The "selected" graphics are a bit too subtle.

I finally found the one I had not taken. It looks like I can now continue.

I also think this is a lesson in how to display something where you had to make a choice. The one I had not chosen was highlighted just like the ones I had previously chosen and confirmed, making its recognition as an available choice impossible. I think this should be labeled as a minor design flaw. Something needs to be done to make the available choices look different some how, perhaps a color change, or have them flash.