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TDC1000-GASEVM: Two transducer ports are performing differently -- why?

Part Number: TDC1000-GASEVM

Above are my scope capture and settings for Mode 0 USING TRANSDUCER PORT #2

Below are my scope capture and settings for Mode 0 USING TRANSDUCER PORT #1

The only settings I changed were CH_SEL to T1 (and of course I turned on EN1 on the first page instead of EN2). As you can see, I am experiencing a voltage drop when I use the T1 port. I should clarify that I am using the same physical transducer each time, so that it not the problem. 

Why, for the exact same circumstances, doe T1 show a voltage dip?