The main thing is that, without warning, it's US-only, insisting on a state and zip. At a guess, the app was created by someone who thinks the world ends at the US borders, or everyone in the world has a US-style zip code rather than the superior postal codes used in a number of countries.
Secondly, it looks as though your inventory is held on a server somewhere, not your device (you can't do anything until you create an account and you can't create an account without state/zip, so I can't be sure). If the inventory IS in fact held locally, why does it insist on account creation?
Thirdly when it complains that you haven't completed all fields, it doesn't highlight the missing ones.
Very disappointing.
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Stick2d
Harleys Boss
MisterDavid