Pistol thinning?

So im entering the 4th week of flowering..everything going really well..but the pistols on my buds seems to be..thinning? from the tips..but not changing colors..is this a sign of something bad or am i just being paranoid?

heres a pic...but i cant find my usb cord for my camera, so hopefully my phones camera can give you all some sort of a look-see..opinions?

May shrink if they have a fan blowing on them, if you touch them. but I wouldnt worry, In 4 more weeks theyll be really small and brown/red ^^

I do have a fan on them, but its indirect breeze, so it should be ok ide think? ive brushed them before with my arm (my setup is very..space-tight..i have to reach down into them) right right..i just didnt want to do something wrong...thanks!