We had a somewhat similar situation in a big game Friday night.
Our U walked off 15 yards for DPI, looked at the chains and they said 1st & 7.
Wait. What? "Is that right?"
On 1st & 10 we had a holding right behind the LOS.
On 1st & 22 we had DPI. So yeah, 1st & 7.
I told him and repeated to the crew later, "Waaay better to ask now than on the car ride home."