In my opinion it look like an intermittent "bug" that you are still able to update.
Why? A lot of reasons:
- The GUI of the store is bad. Missing pictures, bad style, ...
- There are missing basic features like deleting an app (and this was requested already years ago)
- I still can't download my app for testing even build was successful.
- The Pi store forum (from Indiecity) is totally messed up with spammers. Anyone care about that for month. see
http://forum.indiecity.com
-The Store is still very empty. But i understand now why it is so empty.
I am very sorry to say it: But it looks like the Pi Store is down.
The current Pi Store has a very bad vibes for the Raspberry Pi. The Raspbian head should think about giving a command to tidy up the Store and Forum; Or he should delete the store at all. The current situation is very bad. New (and old) guys might turn away if they see that.