Yes! I'm so glad someone else brought this up. I've been wondering ever since I got it, and that was a long time ago, since now I am a level 42 Master in Dragonspyre. The card says specifically "70% to enemy, 30% to self". Instead you get 70% on both. It has been bothering me, and for a while I never even used Feint. But after a while I realized its power and usefullness.
And besides, from experience it does seem as if it only adds 30% to the spell anyway. The only thing is, if you put a Feint on the other one and they put a Feint on themself, then it only counts as one where you could be getting 30% plus an additional 70%.