Delinquent payment on my bank statement!?

Hi,

I'm currently under contract for a new home. I have a HELOC on my current home due the last day of the month.

I was looking at my April bank statement. The HELOC statement is part this as it is from the same credit union.

I made 3 principal only payments in April. I must have thought one of those was my regular "with interest" payment. Well it wasn't because the bank statement shows a $100 delinquent payment on 4/30 even though I paid down the principal.

I made another payment on 5/1 which included interest and it appears to have brought me up to date.

How problematic is this? I have an 800 credit score and nothing was reported to credit bureaus regarding this. The underwriter is going to see this statement though.

Thanks