Seat doesn't exist - Lufthansa

I have a flight booked with my family of 3, Toronto to Frankfurt. On the manage booking portal for Lufthansa, my husband and daughter are seated together, but where I'm seated doesn't exist according to the seating map. It says I'm in row 44, but there are only 42 rows on the map. This was booked in Lufthansa, but is operated by Air Canada.

Has this happened to anyone? Should I be worried? Is it basically forcing me to pay for specific seats?