It appears there are rewards missing from my rewards balance when I try to withdraw.

The sats in your balance are your "pending" rewards balance.  The sats on the withdraw tab are your "settled" reward balance.  Your settled balance is typically less than your pending balance.  This is because sats go from pending to settled after 30 days.  This 30 day period is to account purchases that are returned, chargedback, etc.

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