@Kalpit
Go into the OSD and reset the pen display to factory settings and see if the colours are looking alright? They should, if not then there's something wrong which is strange because your second unit also shows the same problem.
Go into your display settings and change the colour profile to something else just to see if the Huion can show the correct colours (show blue as blue (it's alright with slight variation).
So far it sounds like there's more red with the display. Hence blue becomes purple and yellow becomes pink. Another way is to use the OSD to adjust the RGB to try and remove the red.
@Kalpit
Go into the OSD and reset the pen display to factory settings and see if the colours are looking alright? They should, if not then there's something wrong which is strange because your second unit also shows the same problem.
Go into your display settings and change the colour profile to something else just to see if the Huion can show the correct colours (show blue as blue (it's alright with slight variation).
So far it sounds like there's more red with the display. Hence blue becomes purple and yellow becomes pink. Another way is to use the OSD to adjust the RGB to try and remove the red.