Do yoyu have a feeling that Chests' loot isn't random?

I was wondering if it was just me that suspects loot isn't absolutely random and it tends to give some skins more often than others. My story is that I open chests only for free and among a couple of cool skins I got I've received 2x _Dark Valkyrie Diana_ and 3x _Championship Kalista_. With the number of possible skins and rather low number of chests opened I feel like it is too much of coincidence. Has anyone else had something like that?
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