Tranny problem: 3rd gear

I accidently pulled my car out of gear(3rd), and now it won't go back into 3rd gear. All the other gears are fine. When I try to shift into 3rd, it just won't move. There isn't any grinds. I can take the shifter out of 1st slide it all the way over and the next gear it falls into is 5th. I have had this happen before awhile back. 4th gear was the problem then and it was doing the same thing. Then, one day it just shifted back into fourth and there was no problem with it since. Does anyone have any ideas?

95 GSR tranny