Doubt your System?

When a mechanical trader doubt his system, he should research his doubt and implement it to enhance the system performance.

Not long ago, my system for FCPO suffered the second consecutive losses. Long 2440 was stopped out at 2394. At the same time, system also signaled Short 2393.

This is a bear market and yet my system show Long signal. Weird? So far, in my monitoring of system, this is perfectly normal. So, no need to "doubt" my system.