Which brand of UVB do you use, & what type is it, a fluorescent tube bulb or a compact/coil light?
The brand & type are very important as most of them are not effective in the least, for UVB emissions.
it's a flourescent bulb, big long one, can't remember the brand atm, it's the one that everyone on here recommends, 10%.
Today i looked closer, and one of his legs seems fine, where as the right one is still the same, it seems weak when he tries to stand on it. i tried moving his uvb bulb lower down in his enclosure to see if that helps.