How do I change from expense to deposit?

Yes, you can change the transaction type, santiorf.

QuickBooks Online depends on what your bank shares with us. That may be the reason the deposited check is being posted as an expense, not an income. 

You can reclassify the deposited check if it's still in the For Review tab. This way, your financial records are accurate in the program. I'll guide you on how.

1. Go to Bookkeeping and then choose Transactions.
2. Select Bank transactions
3. From the For Review tab, locate and open the transaction.
4. Choose the appropriate income account from the Category drop-down menu.
5. Click Add.

If the transaction is already in the Reviewed tab, you'll have to undo it. The system will move it back to the For Review tab so you can categorize it to the correct income account. 

Once done, I recommend reconciling your account monthly. It lets you detect any differences early. It also helps ensure your account in QBO matches your bank statement. For more information, visit this article: Reconcile An Account. 

Also, I want to make sure I've got your back. Can I ask for the name of the bank for the transactions posted in reverse in QBO? This way, I can check here on my end if there's an ongoing investigation about this and how to take care of it. Please click the Reply button below to add some details.

I'll lend a helping hand if you need anything else. Take care always.