This situation could occur if your credit union charges a Service Charge fee to members who do not belong to a particular Marketing Club.  
 
If a member does not have funds to cover the Club dues at the time the dues are posted, this member's status in the Club is changed to "P" for "pending."  (This can be confirmed on the TCLUBFEE exception report.)  When the Service Charge posting program is run, the member is then charged the Service Charge fee (since the member is not currently active in the Club).  At the beginning of the next month, CU*BASE runs the eligibility program to determine if the member qualifies to be a member of the Club, and at that time, the member's status is changed to being "active" in the Club again.