QSL in the mail: YN2N 20/15m, SV9GPV 80/20/17/15m, but ????

Hi all,

Today I received YN2N QSL cards for 20/15m QSO's...But he forgot to put our 40 and 17m QSO's !!!!
I also received SV9GPV for 80/20/17/15m QSO's, but he forgot the 40m QSO's...

I'm sure that I put all my QSO's in the QSL I sent them...I really wonder why they forgot some QSO's......Any idea?

73
Ronan, F8AFC