Weird Arp Behavior

Trying to really dive into this thing and see if I can gel with it. I started playing with the arp but I noticed it has a weird behavior. If the length of the notes are longer than the space between each note on the sequencer, the arps seem to overlap. If I set the length of each note so it ends when the next note begins, there is no overlap. In the video below, I start with the note at a 1/4 length, then I make it longer and you can hear thr arp pattern doing a weird cycling thing. It’s really cool, but I’d def like to understand it more. If it matters, the notes are F6, G#6, C6, A#6, and C6 again.

Do you have poly turned on? Perhaps limit it to one voice if so?

I have it set to one voice. The behavior occurs with both 1 and multiple voices.