I don't know why this is happening to you. If it were mine I would try removing the detent ball and spring since it is so easy to remove. I would then try shifting it to see if there was any improvement. It may just be that the detent ball is worn out?? It may also be a problem with the shift rail interlock pin. I removed mine when I went to triple sticks. If you removed yours then you may be screwed,
fortunatley for you, I would be willing to dispose of your truck for free.
