Target Health Not Showing

At first when I started playing classic I could at least see the mob health on the target frame as a percentage, but now no matter what I try to do, the health amount doesn’t show up at all. I haven’t seen anything about my addons doing anything to change the target frames, and have made sure to get rid of anything that had to do with UI changes but still not showing up.
If anyone has a fix, as I’ve tried the RealMobHealth addon as well to no avail.