When uploading photos to Commons, that have been modified before (eg. Gimp correction or any other), default Upload Wizard adds the time of modification to file information instead of the actual creation time from EXIF data. Two examples out of many: https://commons.wikimedia.org/w/index.php?title=File:Pomnik_Syreny_w_Warszawie_2018.jpg&diff=prev&oldid=343992720 or https://commons.wikimedia.org/w/index.php?title=File:2019_Warszawa_Z%C4%85bkowska_11,_kapliczka_maryjna.jpg&diff=343593649&oldid=343429887