You got to delete Blizzard's Stat distribution script first.
See, there's a lot of scripts rewriting the same methods that handle Exp & Level up mechanics. So these methods need to be combined or aliased for compatibility. If not, it's going to use the last iteration of the method.
Synth's Stat script rewrote the Exp method to include points on level up.
But Blizzard's script is below that, and rewrote the Exp method to do it's own thing
AND below that, the Infinitelvls has it's own modification to the EXP method.
and non of these are aliased (building on to what came before it), so it's basically using the Infinitelvls version since it's at the bottom of the list and processed last.
So if you delete Blizzard's Stats and the Infinitelvls script, it'll work fine.
But if you really want to keep the Infinitelvls script you'll need someone to either weave the methods it uses all together, or alias them. Probably about the same amount of work. I'm not really interested in doing it myself.