There's nothing is unfair, if you think it's unfair you can show the post that shouldn't deserve to get deleted.
i'm not saying that i feel unfair that my post has been deleted. but i said i feel unfair with the way of deletion
I do believe it is not moderators activity, it could be Bot behavior.
I have made a total of 27 new posts from October 24 to October 27 - and exactly 27 old posts were deleted in the same time frame.
Every day the number of posts I make and the number of old posts getting deleted are the same.
Moderators cannot monitor my activities for 24H/7 days to find me online and delete old posts within an hour or half hour after posting a new discussion.
First, you need to know that usually someone reports the posts and it will get deleted if mods think that the reported post is a spam post and should be deleted. If more than one person will report the same post, it will further confluence the more members think it is a spam post but the final decision of deleting or not deleting a post is by the moderators.
Now coming to our particular case, do you mean to say that (for example) you did 20 posts from 10th October to 17th October and none of those posts gets deleted? However, did your old 20 posts prior to 10th October get deleted? If this is the case, then there is something wrong i guess.