Service Reminder / Hour Meter Running fast?

Hello,

I have a John Deere D110 Lawn Tractor (2011 model). The digital Hour Meter appears to be running fast.

For example, I mowed my lawn today and timed it. At the beginning of mowing, the Hour Meter read 100 hours. At the end of mowing, the meter read 106 hours. It took me about 35 minutes to mow my lawn.

So is this operating as designed? Does the hour meter run fast intentionally? If so, why? If not, what should I do about it?

Thanks!