"Based on the screenshot you've provided for Client A, the one that's attributed to your invoice is the payment with Paid status, and the sales receipt with Closed status could be a duplicate transaction since they have the same amount but different dates."

You have that backwards. The payment says closed and the sales receipt says Paid. How does that change the advice? It seems I should delete the sales receipt based on what you said, but as @Rainflurry notes it's the *payment" that seems to be dangling in the undeposited funds.