Based on the mildness of your post-test interrogation, it seems likely that you passed. As for how you could have shown "deception" despite telling the truth, it's not at all surprising because CVSA, like polygraphy, is junk science.

In fact, the "National Institute of Truth Verification," which markets CVSA, has admitted in federal court that the device "is not capable of lie detection." And it's worth noting that "Dr." Charles Humble, the fraudster who created CVSA, got his "Ph.D." after taking a week-long Bible course at a strip mall diploma mill:

A couple more things in addition to what George has mentioned.

http://www.ojp.usdoj.gov/nij/journals/259/voice-stress-analysis.htm

"Our findings suggest that these VSA software programs were no better in determining deception about recent drug use among arrestees than flipping a coin."

http://www.antipolygraph.org/documents/UF_Report_03_17_2006.pdf

"The findings generated by this study led to the conclusion the neither the CVSA nor the LVA were sensitive to the presence of deception or stress. Several analyses of subsets of the data were undertaken to explore any possibility that either system could perform under even more controlled conditions, but no sensitivity was observed in any of these analyses either."

http://www.scribd.com/doc/9673590/Eriksson-Lacerda-2007

"In summary, as our survey has shown, the VSA approach completely lacks demonstratable scientific validity. In fact, all available scientific evidence indicates that its validity is nonexistent."

Even the idea of microtremors in our voices (which the CVSA is supposed to measure) is nonsense. 

"Based on the literature survey we have made, we feel confident saying that there is no scientific evidence to support the idea that a microtremor in the 10 Hz region occurs in the muscles involved in speech production."

http://itre.cis.upenn.edu/~myl/languagelog/archives/001149.html

"Specifically, the laryngeal microtremors that these techniques depend on haven't ever been shown clearly to exist, as far as I know. No one has ever shown that if these microtremors exist, it's possible to measure them in the pitch of the voice, in a way that separates them from all the other phenomena that modulate the pitch at similar rates. And that's before we get to the question of how such undefined measurements might be related to truth-telling. Or not."

The CVSA is truly utter nonsense and BS of the highest level. At least the polygraph measures responses that actually exist (despite their not being indicative of deception). 

Hopefully the department you are testing with knows this and is only using the CVSA as an intimidation tool.