I received a refund from the state of California and I don't understand the amount of the refund

In mid-February I filed my taxes electronically with CA. I owed money and subsequently paid it in full. I later discovered I made a mistake that resulted in me receiving a refund instead of owing money. I filed an amended return (it was accepted by CA) in late March. I know I likely won't hear from them for 4 - 6 months. But today I received a small refund from the State of CA for an amount that does not relate to either of the tax forms I filed. I have been unsuccessful in finding out why I got, and am concerned if it may relate to the amended return. Can anyone shine some light on how I can find out what this refund is for?

 

Thank you