Problem scenario
In MetaMask's dashboard, you see a cryptocurrency with a balance that does not seem correct. You click the three dots on the right of the balance and click "Resync Balance." It appears inaccurate (as you just sent more coins to the address of your MetaMask Portfolio). When you click on the cryptocurrency symbol, you see a "Holdings" balance that appears accurate. Why is there a discrepancy between the "holdings" balance of the individual coin and the dashboard's balance for this coin?
Solution
We do not know why this happens, but we found a solution. Close out of MetaMask entirely. Reopen MetaMask.