Rising Edge Problem in FSM

Before you delve into why its not behaving as you intended, I think we to discuss the major problems with your code. This entire design is asynchronous and will result in latches. There is no code that uses the input clock. I highly suggest you use the clock as doing this now will stop all sorts of problems that could occur later. You should also not use generated clocks internally (you have created a clock with go_s) as these can cause timing problems - you should use them as clock enables instead.