Transport Canada has issued a Public Notice for Barbie, Ferrari, Fisher-Price and Hot Wheels branded Teamtex boosters, for irregularities in minimum height required. While the minimum allowed height is 107 cm (42 inches) some seats indicate a 103 cm (40 inch) minimum.
The notice does not imply that the seats are unsafe. You may continue to use your booster seat correctly while waiting for the ‘fix’, which are updated labels and manuals for your seat.
For more information, see Transport Canada’s notice here: http://www.tc.gc.ca/eng/motorvehiclesafety/safedrivers-childsafety-1422.html