you probably have created the overlay next to the BG but the shifts are done after it in separate commands instead of writing them next to the overlay in the BG line like this:
(copied form @Dara.Amarie sice I am lazy to write the explanation down by myself 
)
Typing the overlay next to the background name using the word "with"
​
This is used when you want your overlay(s) to already be placed at the beginning of the scene.
INT. BACKGROUND NAME - DAY with OVERLAYNAME to % x y in zone # at layer #
​Example:
EXT. ATLANTA - NIGHT with CAR ANGLE SILVER to 1.5 220 85 in zone 3 at layer 4
if you will write it like this is should not glitch on any phone