When you switched modes, did you get the dialog about "this will reset ..."?
I mean, that may have not been what fixed mine, I'm a developer, so I'm usually cautious about knee-jerk correlation, but I did reset more than once, and it wasn't resolved, I did switch to zoom and back and it was. The only reason I did it was to check out the zoom mode, but also because I've seen various cases where switching back into a mode forces all the settings to change.
FWIW, I restored from a backup from an iPhone 5, running 8.x.x (latest). If you restored, the only thing I might suggest (other than trying the mode switch one more time), is to reset the device, set it up as new.