The first thing I always ask to see when a player makes a statement like this is a screenshot of their maps played stats. The most common mistake I see is not doubling the maps that have alternate "modes"
For example:
River City = 59 matches played
River City Night = 51 matches played
That means you would actually have 110 matches played on River city. Remember that maps with alternate visuals still count as the same map. They just get split between the alternate modes.
As far as I know, unless someone else has evidence to the contrary, the maps are assigned via an RNG.
RNG = Random Number Generator
RNGs are quirky at times. It's very easy to have a short-term run on a map (that's where you get ugh, Caustic for the 6th times tonight!) but long-term they are designed to even out their "rolls".
Hopefully this will help everyone understand how the map rotation works and let you check to see if you truly have a map rotation discrepancy or if it's just a short run a few times and dislike of a certain map that makes it "stick out" in your mind
