Gator rolls backwards while in forward gear

I purchased a used 2009 Gator 620i a few days ago. While in a forward gear (low or high) traveling up an incline - if I let off the accelerator while still in forward gear and without pressing the brake - the unit rolls backward as if it was in neutral. Also, with the unit in gear while turned off - I can easily push it forward and backward.

Is this common or do I have a potential problem?