I did have an issue with one card, because I tried using it with zipmoney (don't do that, by the way) and it debited $1 to test the card and then failed to add it.
The app has a bit of a bug where sometimes when you go into a card, it shows an empty history. The first thing you should see for any given card is "Initial load" followed by "Card status changed from PreActive to Active due to a load". If you don't see these transactions, kill the app and go back in, and you should see it.
You may now have a preauth like I did with the $1 on the card bringing down the effective balance. Mine showed $100 until I quit out of the app and went back, now it shows $99.