Leaderstats not subtracting properly?

The script I think causes this is here

while wait(0.5) do if exp.Value >= xpn.Value then lvl.Value = lvl.Value + 1 exp.Value = exp.Value - xpn.Value wait(0.1) xpn.Value = xpn.Value * 1.5 end if lvl.Value >= 10 then lvl.Value = 10 exp.Value = 0 end

end

What this does is it subtracts the xpn or exp needed from your exp and raises your level. This functions just fine, but its after the subtraction where the bug starts. When you get some more exp after leveling up it gives you the exp it took away back. Anyone know a way to fix this or a better way to do this?