mail notification issues

2 issues:
A) Everytime I reply on a post I get email notification for every other reply after mine. I don't know how or when I activated this and I can't find how to de-activate either.
B) These notifications mentioned above come with a link that should lead me to the last reply, but this link always leads to a page that says: "The requested topic does not exist."
A) Everytime I reply on a post I get email notification for every other reply after mine. I don't know how or when I activated this and I can't find how to de-activate either.
B) These notifications mentioned above come with a link that should lead me to the last reply, but this link always leads to a page that says: "The requested topic does not exist."