I think it is the cheep metal the mint uses now. I have a few that look off also.They changed in 2012 From the mint--
1996 - 2012
Composition: outer ring 99% nickel, inner core 92% copper, 6% aluminum, 2% nickel
Weight (g): 7.3
Diameter (mm): 28
Thickness (mm): 1.8
2012 - present
Composition: outer ring - multi-ply nickel plated steel, insert - multi-ply brass plated aluminum bronze
Weight (g): 6.92
Diameter (mm): 28
Thickness (mm): 1.75
Two laser marks of maple leaves, each within a circle, at the bottom of the coin's reverse
A virtual image of two maple leaves will appear at the top of the coin ? a different image is produced as the coin is turned from side to side.
Edge-lettering of the words "CANADA" and "2 DOLLARS" are engraved along the coin's outer edge.