I closed and opened the app and they appeared

I got to it via this button at the top of the UI:

It looks to me like your app hasn't caught up with your subscriptions yet. The first day I used Jerboa nothing showed up in my subscriptions list even though I hit subscribe on a bunch of communities. I went to bed and by the next morning it was working fine:

This is probably one of those "growing pains" things that Lemmy and Jerboa are gonna be going through for a while while the folks behind the scenes get things ironed out. I'd just give it a bit and see if they spontaneously appear tomorrow like mine did.

Edit: you might also want to try force-stopping the app and reloading it? That might force it to pull your subscription data again, idk

If you'd prefer you can probably open a ticket on the jerboa github about it, although I'm sure the developers have a lot of things to work on at the moment so it might not get priority yet.

Looking at your screenshot, you aren't logged in....