Two reasons.

1 the US dollar is somewhat stronger today hence a lower price in the States.

2 the share price is always that of the last trade made. SLI is far more liquid here in Canada than on the pink sheets or the Frankfurt Exchange. There will always be a lag in SP movement on the slower exchanges.

It would be fun to have a trading platform where I could pick up cheaper shares in Frankfurt or the States and sell them here but that is too sophisticated for me and the few shares I could afford would not pay for the fees.