Disabling all randomness in custom FX results in randomness.

I'm trying to make a missile like effect, but despite setting all of the *Random variables to 0, the behavior still appears to be quite random.  When I use FX Playground, the missiles are nice and tight, but in roll20 there is a ton of randomness in everything. How can I actually remove the randomness from the effects, or otherwise control it.

I've noticed this also. Trying to make an 'orb' that doesn't move once spawned. Just a pop in, and fade out in the same spot. (Turn tracker highlight..a 1 second flash of light centered on the token) But no amount of setting speed, speed random, angle, angle random, etc to 0 stops it, it always drifts in some random direction each instance.  Even color set to all white on everything, it still has a tiny 'shift' in color randomly each time it goes to fade out. Maybe someone will pipe in and know a solution that helps both of us :)