Here;s another example of an account who's posts have gone down, but they've kept their previous status...
Name: ipbo
Posts: 63
Activity:56
Position: Jr.Member
BTC ADDRESS : 18jxpygrDSf99F3X15sBzW7BC24Jy9oeFu
Date and Time Joined: April 29, 2015, 07:18:41 AM
Name: ipbo
Posts: 21
Position: Jr. Member
Time:April 30, 2015, 11:19:56 AM
Are you cheating? how is your post count become 21 if you are a jr member with 56 activity
Name: ipbo
Posts: 187
Activity: 70
Position: Member
Date Registered: 26 March 2015, 23:19:56
Last Active: 03 August 2015, 13:36:31
I guess, that user keeps own previous rank, after deleting posts, only in case if he login never more, or other option he gain post count again in same 14 day period.