Rolls Forward In Reverse

KaBoom

Test Drive
Location
Beckley, WV
Stopped on a decline, put in reverse to back up, let off brake, rolled forward at least a foot before I reapplied the brake. Held the brake while giving it a little gas until I heard the gear engage. Is this normal or is there something I've neglected. 2009 OR, 185K miles, original transmission.
 
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