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During a recent power outage I lost all UHF stations, but not VHF. Shouldn't I have lost all stations?
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No. Your VHF signals are moderately strong and with the gain of the antenna, probably have a reserve of about 40 dB of signal power. Unpowered amps usually turn into attenuators of around 30 dB (+/-10 dB), so there was still sufficient signal making it through the unpowered amp to provide reception of VHF 8 & 10.
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My signal levels vary wildly, going from signal to nothing in seconds.
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Which specific channels? Under what conditions (windy, doesn't matter, etc)?
Do you have trees in front of the DB8 or do you have a clear shot to the horizon?