I can’t edit the translation

Hello! Thank you for creating Loco Translate. Can you help me with this?: I was translating some strings from WPCourseWare and one of them got wrong, but I can’t edit it again. The first translation I’ve done ahead of the original string, with a gray background, and I don’t know how to remove it from there. It has been left as “context” but the translation does not work. I have tried several things but it has not worked.