Handpairing

Hi, I handpared some actias selene a time ago.
They got stuck, even for 5 hours, but the female was not fecundated, i tried it again, this time at 02:00 at night.
I thought, maybe this works.. same story they got stuck and paired untill 08:00 in morning.
What went wrong?
Maybe, i putted the man at the wrong place..

Nobody?