Makes sense. On my D3 - assuming you used the same key both seats retained their previous setting.
In the D4 three of the seats function as expected, but the passenger one "resets" itself after 15 minutes or so. The dealer believe this is a feature, I am not so sure
I suspect the module has a memory issue, bad batery, broken connection, defective in some way!?
I plan on getting my hands on another D4 to test, but wondered if other owners maybe able to do the same? Would you mind having a play?