Mouse issues in Time Machine

Yesterday I needed to restore a directory from my Time Capsule. I went into Time Machine and waited a minute or so for everything to spin up and load.

I was not able to click on the folders to navigate to the directory I wanted. In fact, I had to use the arrow keys on my keyboard to navigate to the backup I wanted to restore. The directory I wanted to restore was in a directory that I have on the sidebar in Finder. Couldn't click it.

I couldn't even use the trackpad, only the arrow key worked.

Any ideas about what could have been going on?

Thanks in advance!