Hello,
Why yesterday I got mail that my report was rejected and pokestop will not be removed but today I see that actually was removed? Oo This is weird. Please, don’t confuse me next time. 
Don’t know but myseIf I have stopped trying to make sense of “rejected” and “approved” many years ago. Many exampIes of where these things don’t mean what one wouId expect them to mean. As an exampIe, I requested a stop to be moved, providing exact coordinates. It was approved, but they moved it eIsewhere, to a different wrong Iocation.
Welcome to the forum @Aingurth !
iirc, I have seen this happen when two people have reported the removal at close to the same time. If they had already removed the the Wayspot based on another report, they may have rejected yours.