Lower level, not lower power.....you should know this by now.

What you don't know, maybe, is the fact that the priority goes to the player that was in queue the longer.

If that level 104 lost the previous battle and was in queue before you clicked on 'match' then it's his queue that takes priority over yours and so you are a lower level match for him and that's why you get matched with him.

This may happen also if he won the previous battle but was in queue since more than 60 seconds.

Your own queue limitations come in play exclusively if you are the oldest one in queue in that specific moment.

To be clearer, lets say i am a level 105 and i click on 'match' and i lost the previous fight. If all the other people that click on match at that moment are matched then i go in queue. If at that moment you click on 'match' then you'll be assigned instantly to me as my match, regardless what were your previous achievements because you meet my 'l9wer level' requirements for a match.

I hope i explained it to you clearly enough to let you understand how it works.