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Hi guys, I have a questions about Armor spikes

Armor Spikes: You can have spikes added to your armor, which allow you to deal extra piercing damage (see "spiked armor" on Table: Weapons) on a successful grapple attack. You can also make a regular melee attack (or off-hand attack) with the spikes, and they count as a light weapon in this case.

Is that working like Constrict when Grapple? will deals extra piercing damage every time when I makes a successful grapple?

So I'm riding a giant gecko, it has climbing speed. But when it climbed the wall, DM said I was climbing too, so I lose my Dexterity bonus to AC.
I did a lots research, but couldn't find any rules about that.
Anyone know anything about that? Thanks a lot!