To be honest, I wanted to ask about that before, but then somehow I forgot.
Actually I asked that too,
a few posts upper than this one Apparently, in that case of mine, as hosseinimr93 observed, the reported topics got locked by mods.
Besides, I observed also another instance when posts are flagged as good but they are not deleted: this also seems to happen when the respective user gets banned. I reported many users which got banned and they reported posts were flagged as good, but got never deleted. Perhaps it was work in vain, since the users were already banned.
And yes, I also observed cases when the users don't get banned, the reported posts are flagged as good but still don't get deleted -- but these cases were rare though.
As stated by Rikafip, it can be a human error as well.
Oh well, if the mod which analyzed this report of mine sees these posts, maybe he will change the status of that particular post. Let's hope for the best
Thank you all for sharing your opinions again.