It looks as though the right taillight is from the earlier builds while the left is more recent.
a few weeks ago Tesla started using a different tail light assembly for the Y (similar to what is used in Europe). Instead of the middle of the tail light being the brake light, the exterior “C” is now the brake light. What used to be the brake light is now the amber turn signal.
Go out to the car and turn on the left turn signal. It will be amber in color. Now do the right; it will be red.
long story short: schedule a service appointment and they’ll put a new taillight on the right side that matches the left