The penalty was scored while the visitors grabbed a second deep in injury time.
The second leg takes place in Poland next Tuesday.
Kenny says he can't understand how the spot kick was given.
Meanwhile
Celtic are looking good for a place in the group stages.
They beat Hapoel Beer Sheeva 5-2 at Celtic park.
Boss Brendan Rodgers says there's lots of work still to do – but there were good signs last night.
