Inventory count isn't automatically changed yet, unfortunately. To change it, it has to manually be updated since we don't store any inventory information at all, it's just set on the listing, but I'm working on an update to make that more seamless.

As for the wallet, did you deposit the sats into it first and then pay out, or is it that one sat that was showing in the screenshots you sent? I'm currently working on updating the wallet so it might be acting up. If the sats you sent are in your external wallet already, they won't be spendable within the site anymore, you'll just get an error trying to spend them.