CMS members statistic at forumhome jump down when upgrade to 4.0.3
 

I am using VB 4.0.2 the members of my board are 577 and when update to 4.0.3 it jumps to 415 while a new member registered. I tried restore to 4.0.2 and upgrade again some times but it is the same status. Can you help me solve this? Thanks.