Bug - Normal Back to school relics ratios seems odd

[Isoco3]

I got in the top 100 in this event just to win the rewards, but what i got in the relics was too unusual, i got 5 Graveyard Shift valentines, what is the probability to this happen? i think its a bug, here the screenshots:

 

[BallotBoxer]

I am almost in the same boat. I also got a suspicious silver fixation.

8 Back to School relics --> 7 Ivy League Parasouls

I can't complain because one of the 8 was the lucky anomaly: Heart of Darkness Double (that's like getting struck by lightning twice after finding a four-leaf clover under a winning lotto ticket level of luck). Quite happy with the Double, but I'm wondering why couldn't one of the Parasouls be a Filia?