My rods are missing the endcap nubbies
If you are feel that you are missing some nubbies, chances are you aren't. On the two side rods, either side of each will have nubbies on them, but for the four upper and lower rods, you will find that they only have one nubbie per rod. That is normal.
We purposefully leave one side bare so that side can overlap within the pocket of the screen. They should overlap inside the pocket of the material for structural integrity and because they are usually cut long enough to do so.