Your experiences sound similar to a shinigami's chikan -- memory replacement. We often employ these devices after a Hollow causes a lot of collateral damage, to minimize trauma to the living.

[Rukia looks down at her tea, picking up her cup and letting the warmth seep into her fingers.]

I cannot say for absolute certainty, however.

[If someone did alter his memories, his file might have record of that as well. But she's reluctant to suggest revisiting his file -- it's obvious he's uneasy about it, and she doesn't want to trespass where she isn't invited.]