Track Set Randomness

I know which track set comes up is completely random, but I've been noticing something lately and wanted to bring it to Hutch's attention. Sometimes, it seems an event gets stuck in a rut and keeps selecting the same track or two over and over again.
In the current Rare event, after seeing the four track sets, I have now raced 10 straight races (within 30 minutes) and pulled one track set 7 seven times and a second set 3 times. The other two have been MIA this entire run. That seems pretty lucky (or unlucky in this case).
In other events I've noticed similar runs of one track set for several straight races as well.
In the current Rare event, after seeing the four track sets, I have now raced 10 straight races (within 30 minutes) and pulled one track set 7 seven times and a second set 3 times. The other two have been MIA this entire run. That seems pretty lucky (or unlucky in this case).
In other events I've noticed similar runs of one track set for several straight races as well.
Comments
Ive also noticed that if you keep getting wet track sets, so you swap in another 4WD or standard tyre car, the wet tracks will instantly be gone. I certainly don’t feel that they’re random.
also, with diverse rare as an example, whenever I get the drag race set, every competitor has the el Camino, but never has it on any other set. Is that because they quit match if they come to that set again without the right line up? Perhaps I’m playing wrong!?
Obviously, with such a small sample set you can't say too much with a degree of certainty but it certainly looks like this is nowhere near completely random. It has happened a lot where I get the same track set 5 times in a row, odds of that I reckon are 0.25^4= 1 in 256.
If I only I was so 'lucky' with my pack pulls
I'm guessing they are using a normal random pick from the track sets, but the problem with normal random is that in small sample sets it's fairly likely that you get uneven distribution, and if the track selection is affected by what defensive replays are available it will make it more likely that the track selection get skewed.
Also I'd be curious to know whether it would theoretically be possible to manipulate the selection by not racing a certain track set. As in, if there are three sets of asphalt and one snow would the snow one appear less if all players just quit instead of racing when they were given the snow set.