Is BoxOfficeMojo a reliable source?

Hello!I recently had a submission declined, and I'm not quite sure why. I was attempting to correct the Belgium release date (2020 -> 12 November 2014) for The Best of Me (2014), and I cited Box Office Mojo. I was under the impression that Box Office Mojo was owned by IMDb and cites actual Box Office numbers. If this is not the case, please let me know!#260414-174729-424000https://www.boxofficemojo.com/title/tt1972779/?ref_=bo_se_r_1