This is a common occurance with the controller in question. That little wheel, the one where you set how long each station will run. It gets out of adjustment and the last station stays on when the cycle is finished. Check to see if that wheel is in position between station number 6 and station number 1. When the cycle is finished turn that wheel clockwise til it clicks into position. That just might cure your problem. Here's a link.
Click on the first link. The PDF. Look at the picture where the #3 terminal is. See that black dot above it? That's where the wheel should click at between stations 6 and 1.
http://search.yahoo.com/search?fr=msgr-buddy&ei=UTF-8&p=R406DLG
Good Luck!