After you performed the paper path registration the image can be shifted in X direction (feed direction). This offset occurs mainly when you use A4 or Letter for the paper path registration.
Possible causes:
The bulk media has media registration settings from a previous media registration setting.
The sheet length of the bulk media differs from the nominal sheet length for this media.
The paper path registration for A3/Ledger was performed before the paper path registration for A4/Letter.
The printer is not sufficiently warmed-up. The mentioned offset in X direction (feed direction) is related to the temperature of the environment and how much the printer is warmed up.
Perform one or more of the following actions depending on the possible cause:
Set the media specific registration settings of the bulk media to 0. Perform the paper path registration again.
Enter the actual measured sheet length of the bulk media via the manual media registration adjustment.
First perform the paper path registration for A4/Letter and after that perform the paper path registration for A3/ledger.
Make sure that the printer is warmed up. The printer must have printed for at least 20 minutes. Perform the paper path registration again.
Perform a manual media registration adjustment for the bulk media.