The percentage of your Magical and Physical Attack, as well as Reinforcement, have absolutely nothing to do with the difference between a Glavie and a Spear. When they say that a Glavie has a higher Physical ATK / Reinforce, and a Spear has a higher Magical ATK / Reinforce, they're talking about the fact that if you had one Glavie, and one Spear, both NPC weapons, the same Level, and identical, in all but the aspect that one's a Glavie, and the other a Spear, that the Spear would have a higher M. ATK, and the Glavie would have a higher Phy. ATK.
With your Glavie, you're just lucky that your M. ATK has some nice percentages. If you didn't alchemize it yourself, the person that sold it to you did some nice Alchemy with it. All you have to do is change the Phy. ATK, and you'll be fine.
If you have a question about percentages / Physical, Magical Reinforce, or anything other Stats, I suggest you check out EllisD's Guide
here.
