Mystery Heroes - 3 clones in every game

Hi,

Not sure about this but I noticed a change in the way characters are selected in Mystery Heroes. I played several games in a row and in every single game teams were having 3 times the same hero at the same time. I often play this mode but never noticed such a thing.

Does this mode had modifications recently ? Can we go back to something more random ? Or may it be a coincidence ? If so, can there be a rule in the algorithm to avoid having such a situation at such a high rate ?

(here is another less important point)

Also I would like to take advantage of this post to notice that I come across the same characters extremely often, and some others never come. I’m hoping for a true randomness but anyway, I like this mode as is.

Thanks for your attention