> Because I know I am definitely guilty of that, I can swear I remember bits from my family's trip to Pompeii when I Was 2 years old, not much but little bits here and there, and only when I was older I noticed that what I remember is suspiciously similar to what my mum has in the family album from that trip(which I most likely would have seen as a child too).

Maybe in a sense, both are true? When you saw the photos as a child, you did remember them then, but that's what reinforced those memories enough that you now remember them?

Similar to 'remembering that you remembered X', even though you don't directly remember X now.