Lightbar color

hey , can someone help me withe the lightbar color contrast ?  i 'm trying for 2 hours to determine what is making my light bar color be lighter on the left side and darker on the the right side , i have the same template for both but it seems that ,that  does nothing to change it , i've tried to use different bar color templates but same thing , there is a color difference somewhere , only in OpenIV model viewer the lgithbar color contrast is perfect with no difference but in game it isnt . Wondering if someone could help me :  )   thanks in advance if its possible

(what i did is that i have deleted the red left side and copied the blue light bar from this car since i want to make a reskin https://www.gta5-mods.com/vehicles/volkswagen-passat-b5-ukraine-police-policia-ucrania)