Arpeggiators - I don't understand!

Hey i was a little bit confused and discovered some weird behavior about the arp in my analog keys. I tried to get a easy arpeggio going and i didnt had any other instruments hoing so i didnt realized that i was in triplets with time set to 8! (I think it was 4/8 triplets) To play it even (4/8) i set 12! Which feels a little bit unintuitive. The nice thing about it is that u can make pretty complex rythms by stacking some arps or combi ing a arp with anything else. But when i used the rng parameter with a triplet arp the arp was getting a little bit weird and changing the order of the notes every 2 bars. Dont know if its a bug or a feature but i liked the chaos. Anybody else experienced that?

I just played a chord on grid on the first step of the sequence.

4 note arp tru time 8 rng 2 for anybody who wants to recreate the settings. I wanna try it with an external clock to see if its somehow connected cause the timing feels kinda wonky too.