Game Mechanics: Monk weight penalty not working correctly?

[Pfap]

So please correct me if im wrong but monk weight limit is 14, so my monk weighs in at 16 and has 700 AC.

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So i removed my Jboots and loose 3 AC from this 1 AC item (weight is 16)

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So i put my jboots back on and remove my helm that has 5 AC and i loose 9 AC (weight 16) and put the helm in my bag (weight is now 10)

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Now i unequip my jboots and only loose 1 ac.

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Wtf?