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The two biasing lines are transmission lines and are part of the circuit. It would be helpful to look at the stability circles for the device and see what is going on at the oscillation frequency. You normally want to arrange for the output match to follow some trajectory which delivers stable...
A VNA is usually designed to operate well with the maximum power that can come out of Port 1. Typically this is 0 dBm to +15 dBm. If you exceed this maximum value into Port 2 you'll either compress the receiver and get reduced gain answers or you'll fry the bridge and need a repair. I advise...
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