Can someone tell be why when I enter a manual deposit it credits AND debits my account?

I’ve got the information you wanted to know, @tawnemarkley.

Thanks for reaching out to the Community. Let me share how QuickBooks organizes debits and credits when entering bank deposits.

When entering bank deposits, it affects at least two accounts in your ledger. This is the basic formula on which double-entry bookkeeping is based. This is actually happening to all transactions. There is no limitation on the number of debits or credits in an event, but the total dollars of each must be equal.

You can access a sample entry, then select More and choose Transaction Journal. By this, you’ll be able to view the movement of funds from one account to another through debits and credits.

You can visit the article that explains how accounts are affected by debits and credits for additional reference. You can also seek advice from an accountant.

I wish you and your business continued success. Please don't hesitate to contact me here if you have any other questions. Have a great day!