Why aren't my Glacier hops bines the same color?

[ThreeDogsNE]

I have two Glacier hops bines in my garden, or at least so I think. This year, the largest bine on the more robust one is red, while the other plant has only green bines. Do I have an imposter? To anyone growing Glacier hops, what color are the bines on your plant?

 

[jfrank85]

The largest, strongest bine on my centennial is a reddish hue while the rest from the same rhizome are green. Must be a physiological issue, nothing more.