Looks like the fire arrow has model issues, appearing as a floating bunch of pixels instead of an actual burning arrow. The different fire model is from Quark, and has nothing to do with this error.

Seems like it should either use the default shot arrow model (more compatible with resourcepacks, and more in line with a Flame bow) or have its own proper model (allowing for an arrowhead that looks like burning coals).

It's an intentional texture, not corruption. But I can see why it might look that way. I'm closing this issue since your other open one is more relevant since you're proposing a sprite update.

Oh, so it's intentional design. Perhaps it could stand to be retouched a bit to not look like it's just a floating flame, but that's just me.