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I wish I had an answer, but I had the same problem initially.
It was especially bad when I first got the grenades. I decided to try them against Fly Traps, so I could practice aiming. Well, I'd toss one at a Fly Trap, score an initial hit, but then nada. This happened over & over again, 'til I finally gave up. It was like almost all of my grenades were "duds".
Later that same evening, however, I went after the Vets that patrol in front of Fort Dundee on Padres. I don't know what made the difference -- they're about the same level, and, if anything, the Vets are harder to hit than Fly Traps -- but I was finally causing damage and scoring some rep.
I still got "duds" off & on over the next couple of weeks, but I could never figure out why. Sometimes I would successfully blow up an enemy, but then the grenades wouldn't work on the new spawn. Or I'd get halfway through defeating an enemy, only to have the grenades suddenly stop working and the enemy "re-set". I just got really good at paying attention to the health meter of my target. If I saw little or no effect after a few grenades, I'd stop wasting them.
FWIW, I've had fewer problems with "duds" as I've gone up in levels -- my grenades are now 11 -- so that might have something to do with it, too.
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