Why would a balance in account list not match the balance in the register

Question

One of my accounts shows money in that account, however if I open that account and look at the register, the last balance is $0.0.  I can not determine where Quicken is pulling that balance from.

The account in question is an old account with Fidelity. Fidelity shows a zero balance, but for some reason, my account list still shows a balance.

bassemir · Answer

ahhh good to know, thanks

NotACPA · Answer

Just for future reference, here's the "Sell All" function:

bassemir · Answer

thanks for the answer. I could not find a "sell all" option and this account had many different securities that were sold and moved to a new managed account.  I went back through back up files to find a clue as to what happened.  Apparently the account in question had a mismatch in the number of shares of securities between quicken and my financial institution. Since Quicken thought I had more shares, those securities were adding $$ to my account. Once I fixed those mismatches, the problem was solved.

Thanks again for the   response.