here where I am flashbacks are different than forgotten memories.

here where I am a flashback is literally mentally experiencing a traumatic event as if it was happening right now. and they are triggered by something in the present moment.

example (using a non triggering thing so that you can see what I mean)

yesterday morning I had bacon and eggs for breakfast.
today I was talking to a neighbor and she stated she was hungary for bacon and eggs.
this caused me to mentally relive having bacon and eggs yesterday but it felt like it was happening right now. it felt like I was still sitting in my kitchen with a plate of bacon and eggs in front of me, I could see it, emotionally and physically feel it and I could hear what was going on in the kitchen when I was eating bacon and eggs yesterday.

some places call flashbacks..... having hallucinations because the memory feels so real.

on the other side of things its normal for human beings to remember something and then forget it and then remember it again. its called short term and long term memory.