Odd bug I think I came across

While doing a quest on the Broken Shore, Felrage Strand where all the naga are on the coast, 75,27. I came across a bunch of critters lined up in 4 rows, 24 in total who were moving slightly and then every 3 sec or so would switch spots with the critters across from them. sorry i dont have a video of it just a screenshot. i was kinda mesmerized by it. I did mount up and fly into the air for second and when i descended down they had all vanished. https://imgur.com/nkNdunD