New here, so sorry if I failed at searching, but was unable to find my answer. I hit Plat for 2015 and got my 2 RPUs (expiring 1/2016) so i used one in Aug and then one in Dec *after* hitting Plat for 2016

, so I had 3 RPUs in my account. After using the 2nd one, now my account shows 1 RPU expiring 1/2016 and 1 expiring 1/2017. Was I supposed to manually select the older RPU? Why would it take one of the new ones when I had one expiring?