Is this normal?

Might be low temps.. Which strain are you growing?

For example, growing with led in low temperature and using direct fan over the canopy could add upp to too low surface temperatureof the plant. Al least that's what pops up to my mind, only the tops are misbehaving it seems.
 
It is an indica dominant called Radical Juice, from Ripper.
So do you suggest i try to get the temp up or just leave it as is right now?

Only the tops yes.
 
It's normal. Just the way the genetics are expressing themselves. Looking at ripper seeds website the pictured flower doesn't have any purple in it. I'm guessing your phenotype just picked up on a recessive purple gene. Your temps aren't anything too crazy, similar to what I grow with. Enjoy the purple !

(edit) If you follow the lineage you will find it has Mendocino Purps in it.
Mendocino Purps >>>Grape Ape>>>Zkittlez>>>Runtz>>>Radical Juice
 
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