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This appears to be an Android 7.1 "feature". I don't have Android 7.1 here to test with (yet). What happens if you turn the device 180 degrees (upside down) - does the droid navigation bar then move to the right-side of screen?
Until now, AFAIK, Android has *always* put this bar to the right-side, which is why it works correctly on all devices except Android 7.1. I'm guessing that others might be having this issue too, and I'll need to address it.
But if it "fixes" the issue just to rotate your device 180 degrees (turn it upside down), then at least we have an easy work around.
Here's a link where the author describes this Android 7.1 "fix" which is messing us up.
http://www.androidpolice.com/2016/10/...ar-doesnt-move/