It's even worse with me. I fly like I normally fly with my instructor and he quite happy with the check ride. Then (and this could be an hour later), the same man takes me for my LPC. I am awful. He commented on it and asked why I was nervous, it was only him?!
I said yes, but you're not an instructor today, you're an examiner!
I have my next LPC due shortly; I'll let you know if I'm still the same!
So mjc, this doesn't help you except let you know it's not unusual and other piltos are the same!
Cheers
Whirls