Skills sometimes do cost something different than what they should cost even though they're not affected by global or local effects. In your special case however it's very likely to be the effect of QZ or some of the realm of torment global effects.
10->14 (40% increase)
Looks exactly like one of the RoT Effects.
However Guildwars sometimes has problems rounding skills. I've often casted a 5 Energy spell at 4 Energy though the rounding problems seem to be more prevailant in higher energy cost areas. If the cost is one number off, it's probably a rounding error. If it is more, check the global effects.
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