I took a closer look at your account and can confirm the numbers add up. There are two things going on here.

First, the ~$620 shown on the sale page is the gross amount buyers paid across the 113 purchases from your sale. The payouts page works with net amounts, so after payment processor fees and revenue sharing that comes out to around ~$535.

Second, and this is the bigger factor, your account has 30% tax withholding applied based on the tax interview you completed. The balances on the payouts page are shown after withholding. That brings the payable amount from your sale to around ~$375. If you think the 30% rate shouldn’t apply to you, for example if your country has a tax treaty with the US or you didn’t provide a tax ID when filling out the interview, you can update your tax information from your seller settings to get the rate reduced.

As for pending vs available: your sale ended July 6th, so by the time you posted, most of the sale purchases were already older than 7 days and had moved from your pending balance into your available balance. The pending balance only reflects purchases from the last 7 days, which is why it kept shrinking rather than growing after the sale ended.

Your pending and available balances combined currently cover the full sale amount plus your other recent purchases, net of fees and withholding. Nothing is missing from what I can see.