Ah, that's probably the culprit then. I hadn't even thought of the itch app. Looking into it, thanks for the report!
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That's strange. There should be a file in User\AppData\Local\LD41 called SaveData.game with all your stats. Might check and see if that file exists or is getting deleted somehow. A new one can be generated by going in and out of the options menu.
Might be a rare bug. Ammo should always be buyable if you have $5. If it keeps happening, knowing the circumstances would be very helpful - (Web / desktop version, what browser, what round it happens on, etc.)