I noticed right away early on with Nate that when he was first put in the conv home, he always leaned to the right whenever he was sitting part way up in bed.
We would always kind of laugh about it and he would try to correct it but he always end up back there.
He couldn’t tell he was doing that either.
It sounds similar to what you’re talking about.
Also he has recurring dreams that he is in his wheelchair, going into his old job, then getting up and walking thru the store like nothing ever happened.
Then he gets back in it and goes home.
It bugs him too. He tells me whenever it comes back.
I would guess that as his subconscious trying to bring him back to when he was ok, before he got sick.