I've received 14 male skin shards and 0 female skin shards in 2019

I've been tracking my loot from hextech chests and so far in 2019 I haven't received a single skin shard for a female champion. I've received 14 skin shards for male champions. What's going on? A little math: I count 570 male skins and 320 female, going by the [rules listed on the wiki](https://leagueoflegends.fandom.com/wiki/Hextech_Crafting#Hextech_Chests) (Between 520 RP and 1820 RP). I'm probably off by a few, but close enough. **(570 / (570+320))^14 = 0.00195**. In other words, that should happen less than 0.2% of the time. So am I just having bizarre, 1-in-500 luck, or is there some other reason this is happening? [Full list of skins I've gotten this year](https://i.imgur.com/GhKITYL.png)
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