Correct, it's because dbstr_us.txt is missing them. Even generating a new strings file against your spell table from Alla's spell editor doesn't fix some of them, I know I have some Vet AA's past the glyphs that show up like this. Wish I had more info for you, but all I can assume is that the effects are from live, and have yet to be coded.. if so, all in good time!
Edit -
Here is a topic someone else made about this, and Kayen explains in awesome detail what causes it.