Tracker's Knife wards placed counter

Tracker's Knife's 'stealth wards placed' counter reads incorrectly.

1. Purchase a Tracker's Knife
2. Upon hovering over the item, the 'stealth wards placed' stat will be wrong. I have gotten 39/3 on Dr. Mundo and 50/3 on Vi. Trinket wards and sightstone track it correctly.