the MMPI is a personality assessment - you can't actually "fail" it (because everyone has a personality!). what it does is ranks you against the rest of the population on a variety of different aspects, so that you can see how you stand compared to the "average" person. maybe your distress levels were a lot higher than this particular DBT group is able to accomodate. this doesn't mean you're a failure, just that this group has a different client intake criteria and that you might not get the best out of this group also. kind of like offering a healthy diet and exercise program to someone who need heart surgery?

the results being inconsistent just means that your particular results might not fit a standard profile and that the clinician found it hard to draw a conclusion based on your exam. i dont doubt that you answered everything as honestly as you could, but it's a SUPER long test, so sometimes we answer one item one way and then a similar item a different way -- not because we're lying, but just because it's the answer that seemed right for that particular question. i've had weird results on different personality tests (e.g., that i'm an introvert who enjoys being the centre of attention) so please don't put too much stock on this particular test.

did the psych give you any other suggestions of treatment options that could be more appropriate?