This bit of forest here on the map that juts onto private land is not a forest, it is the back yard lawns of homes. 
The forest should follow the fenceline of the homes at #42 Steen Dr. & #96 Kenninghall Cres. The fence line can be seen on this map, http://www6.mississauga.ca/missmaps/maps.aspx#map=18/-8874320.15/5404909.04/0.9075712110370514
Perhaps the error was made about 9 years ago when this edit was made... https://www.openstreetmap.org/node/1348750038#map=17/43.60810/-79.71669
The homes have been there since the 1970s. 