Fuel leak trails a bit odd?

[Stonehouse]

I've been testing a new version of my flak script and have been noticing that what I think are fuel leak trails are acting a bit odd. Getting quite angular kinks in them rather than the curve you'd expect and just looking a bit odd especially as the aircraft descends. No mods in use by the way. Anyone else see something similar or is it just a problem with my install?

Some pics to show you what I mean.

[razo+r]

Same is happening when you jettison fuel