I have exported the audience groups I want to analyze. I then try to sort them by "member since", to see how many members were added each month. Is there a reason that I cannot sort them out from most recent day to less recent day? It will sort by date, but not by year, i.e. all of my August 31st are together, from 2014, 2015 so it doesn't actually sort by calendar date. Additionally, I have no recent dates although I know I've been adding members. I only have a handful of new members in 2016, and I have to find them manually. Is something wrong with the dating system? Please assist.