sticky stick

when i shift my car first doesnt really do it, second is starting too and third does it all the time. When i shift into third then start driving in third all of a sudden the stick will pop back into 3rd, leme C. it is like the stick is going to far. the car seems to be in gear still but the stick moves. Ya know how u can put the stick in a gear and if u bring it in more it will go but it wants to go into the middle of this gear. Wtf, is the tranny loose. is it the stick itslef wtf Help me please/

make sure theres enough tranny fluid

Lube the cables, change out the tranny fluid for some Redline ATX or similar lube, disassemble the shifter, wipe up all the lube on the pivot ball, and relube it with some quality, lighter weight grease (not axle grease!)
This will help shifting alot!