You might not have spammed. But you may have posted in a topic that was trashed.
Or some mod may have accidentally blown out your posts while blowing out some other.
Or you may have unintentionally spammed.
Excellent scenarios that are common scorpio!
Another cases include deleted accidental double posts (usually server/connection problems rather than pressing post twice).
I found two posts of you that were not in the public forums, and hence not visible to you.
About the spamming, if a whole thread is removed, it might also include your post, even if there is nothing wrong with it.