Which test? (Not familiar with a "400+" test.)

But any test worth it's salt has validity factors built into it. You may have made your case worse while trying to fake it...but I suspect it has you figured out anyway. One of the validity factors, for example, may have been:

Defensiveness Scale (K): A very subtle scale used to pick out respondent's tendency to fake on the test in order to make themselves look better. While the Lie Scale and the Defensiveness Scale seem similar, the Defensiveness Scale focuses on lies due to "defensiveness in admitting problems" (Trull, 2005), and is done extremely subtly; whereas the lie scale detects simple lies meant to cast a better light on oneself.