What it could be is something like +/-15k for "normally" and get a +/-5k adjustment on your power or so depending on whether you won or lost last fight
So in this case, you are a "23500" matched with a "37k" which is within the 15k limit.
And if there is no one within the +/-15k for 1 minute, than you can get matched with people outside of that range.
Just my guess thou.
I mean the matching does do SOME filtering, because I have never gotten anyone below 20k or above 65k unless the 1 min mark is up thus far, so it does something. But the range is really huge and chances are whatever the win/loss adjustment is, it can either be canceled by the win/loss adjustment of your matched up opponent (win vs win or loss vs loss is equivalent to no adjustment matching) or the adjustment is small compared to the match range that it doesn't really help much (some, but not match)