Worm trails?

Hey so I've been doing pretty good and having consistent dips now like the example below but I've been having this problem with some controllers they seem to be worm trails but the thing is I'm not doing anything that I know causes them I have my gun at like 10 inches or further and my water temp was 86 when I dipped the 2 failure ones I was wondering what other variables could cause this prep, technique, etc. Thank you 

(The dark blue one overlaped but ignore that part and look at the smaller details on it and on the white with blue those purple lines aren't supposed to be there either and on the brown one it's those small little mud lines but they didn't come of when I rinsed so its not dirt even though it looks like it)

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