Oh, please don't ask me to do math on a Friday!

Forgive me, I'm at work now and not in front of my synth, so I'm going by memory. When you set up the LFO rate, and you are sync'd, little graphical notes show up in the rate display. It will tell you if it is sync'd to a quarter note, or "less than" a quarter note, etc. Make sure it is set to the exact value, not the "less than" value.