I have the same case, however, I am confident that I answered or input it right and not a mistake. I never claimed any points for it as a valid job offer since I hold a PGWP and my employer not on my current work permit (therefore no points claimed). I attached my offer of employment thought it's not an offer it was now a "confirmation of offer of employment" since the offer was made last year in August 2019 to work in the same company in a permanent continuous non-seasonal job. My other friends do not have the "offer of employment" tab/upload, try to review your profile.