dice algorithm is clearly flawed

[Knibbeltje]

This game: https://boardgamearena.com/table?table=944675465

-Just one 6 in the last 30 turns
-Six 2's, but no 3's at all in 49 turns
- Ten(!) 11's

The game before that: https://boardgamearena.com/table?table=944658976

twenty turns without a 5, 6, 8 or 9

Honestly, I know nothing about statistics (so correct me if I'm wrong) but it seems to me this can occur sometimes, but i experience these statistically ridiculous sequences all the time. I can keep posting links to games..

[Jontia]

This game: https://boardgamearena.com/table?table=944675465

-Just one 6 in the last 30 turns
-Six 2's, but no 3's at all in 49 turns
- Ten(!) 11's

The game before that: https://boardgamearena.com/table?table=944658976

twenty turns without a 5, 6, 8 or 9

These things are not even very unlikely.
1 six in 30 turns has a one in 18 chance.
Six 2's in about one in 500.
No 3's is about one in 17.

You're picking these after the fact too, so really that no threes is a Or condition of no 3's, no 11's or any other whacky thing.
The chances of any individual game having something 'odd' happening are actually really high as long as you don't specify what 'odd' means before you start looking.