https://imgur.com/a/UzABL3E (some images)
I believe it was the Champions: Balance update that broke the iboga's Crippling Anguish projectile effect, or at least there-abouts.
It stands out very noticeably. Have run -repair in-case it was local file corruption, does not seem to be the case. I can list hardware specs, but I don't think it matters, everyone I've asked can see it too.
The player merged soulbeast version of the skill seems to be working normally still. Similarly, it looks normal for wild iboga mobs. It's only the ranger pet version.