Schwab account cash balance

Demoleon

I have one (out of four) Schwab accounts where the cash balance doesn't reconcile. It's driving me crazy as up until a few weeks ago everything balanced. Schwab shows $641.83 more than Quicken. I have downloaded transactions from Schwab and Quicken into Excel and checked them off well back into 2021 and all matches. Can Schwab's balance be incorrect? Not sure where else to look. Anyone seen this before?