it's important to realize that there are other dissociative disorders that can cause memory issues including derealization and depersonalization and other things in general.

i'd think if you generally are okay on a daily basis and tend to experience it more in therapy, it could also be related to anxiety. that is one thing for me that triggers dissociation anyway, though not always related to DID which i have a diagnosis of. i also experience other types of dissociation on top of/mixed with the DID. there are a lot of things that can overlap like that.

like it was mentioned, not everyone remembers everything or a lot, if anything at all, for chunks of their childhood, especially early years. one of my sister's has limited memories until she was around nine. my other sister can't remember the layout of one of the houses we lived in where i can, which was where some trauma happened, yet i have limited memories of a lot of the trauma. so, people's memories differ a lot including events they have gone through together.