2016 MB Pro and LG 4k + LG 5k; issues using adjacent ports?

I have a new 15" MBPro and have both the 22" and 27" LG USB-C/Thunderbolt 3 monitors. I tried connecting both monitors, and interestingly when both are plugged into the R side of the machine, the smaller monitor would not light. It actually had to be plugged into a port on the L side of the machine - and then it functioned just fine.

Any thoughts on this?

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