I'm using Rockbox on a Sansa Clip Zip using the latest Rockbox dev build. Throughout this post I'm referring to this screen here:

I've found that when cycling through Repeat options using >> , Rockbox gets stuck displaying the "Shuffle" option. I can keep pressing >> and still "Shuffle" will be displayed. When I return to the Now Playing screen, a different Repeat option (such as A-B or All) may be shown to be selected. If I then go back to the above screen (the one with the Shuffle and Repeat options), Rockbox will display the correct Repeat option (i.e. the option that is currently in use).
It's just weird that when cycling through the options, Rockbox gets stuck on shuffle.
And to be clear, I'm talking only about the Repeat options (Off, All, One, Shuffle, A-B). The Shuffle options (Yes, No) can be selected without any issue.
I noticed this bug earlier today (with an older version of the dev build). I've updated to the latest one to see if this fixed the issue, but it did not.
I hope I've explained this clearly. :/