Do you get 2 clicks in when going from 12 to 14? Or is it a single click and then the rest go normally?
Shift all the way and then click up once. Adjust until the derailleur and chain line up to the 13 using the barrel adjuster. Check that the chain runs quietly. Click up one to the 14. Does it align properly? Go the other way. Does it go down to the 12 properly? If it won't go to the 12, adjust the limit screw so it falls in. If none of this works, something is probably bent. Are you sure you are using shift cable housing with the parallel strands and not spiral brake cable housing?