Mistake in entry for Concordia 1873 voyage?

Hello, my ggg-grandfather and family was on the Concordia traveling from Christiana to Quebec in 1873. I have found his name reviewing the scanned passenger list available on the Library and Archives Canada website: https://recherche-collection-search.bac-lac.gc.ca/eng/Home/Record?app=voypaslis&IdNumber=1013&q_type_1=q&q_1=norway&Operator_q_1=AND&q_type_2=q&q_2=Christiana&ecopy=e003536787 When comparing this Library and Archives Canada information with what is listed on this site (/ships/concb/), I see that the departure and arrival dates are different. Does that mean there's a mistake on this website? I do believe it's referencing the same voyage, because this site describes a quote on the passenger list that is clearly visible in the scanned document at Library and Archives Canada. If there is a mistake, how can it get corrected? Also, what are the sources for the information included on the voyage description on this site? I'd love to find out more about the stories included in the entry for the Concordia here.