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Problem selling shares after a stock split

Trying to enter a mutual fund sale, but Quicken disallows it because it believes there are not enough shares in the account. The fund had a 5-for-1 stock split in 1997. Entered a stock split transaction with the number of old shares (612.250) and the number of new shares (3061.250) back then. The share count matched on the subsequent account statement. Many annual distributions since, all reconciling with the account statements. The account register now shows 4951.561 shares. Now tried to enter a sell transaction for 3969.829 shares. Quicken disallows this stating it’s more than the 2253 maximum available shares of this security!?! Now what? Again, the register states there are 4951.561 shares in the account. (Quicken R30.10, Windows 10)
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Answers
Trying to sell from the wrong account, and
Trying to sell the wrong security (because of similarly named securities).
q_lurker - thanks for your suggestions. Did a double check of the account and security name, and they were correct.