Stat Reforges can go above level 20?

Yes, this is because 20 isn't actually the cap for all reforges.

-Dexterity on bows can go up to 23.

-Lightning/Fire Bolt and Blaze max damage on wands can go up to 25.

-Blacksmith EXP can go up to 14! (instead of 10, which is generally believed to be EXP reforge cap).

-Tailoring EXP can go up to 15.

-Handicraft EXP can go up to 12.

-Windmill EXP can go up to 15.

The current layout for the reforge page in this wiki does not allow for "level cap" information, instead uses generalized guideline. For example, Wiki generally lists rank 3 as encompassing Lv1 through Lv 5, but in reality, the majority of reforges at rank 3 are actually capped at Lv 2.