Issue with a text entry box

Hi,

I have created a slide where the user types their guess into a box, hits tab and then the answer comes up in the next box. It all works well except for the 1st box---for some reason it highlights their answer when I hit tab but it doesn't do that on the other ones. I've checked the tab order and I can't see anything unusual that would make it happen. I am sharing the slide here. Any suggestions would be greatly appreciated.  Ignore size of box for text entry---this is a copy of the slide and for some reason, it makes it smaller than the original file. 

Thank you,