Which version of Moodle are you using? Possibly, there is a filter that is causing this to happen. Depending on your Moodle version, you can enter edit mode for the lesson, then click the Filters link under Administration. Look and see which filters are on and experiment with turning off Convert URLS into links and images, Multimedia plugins, and if you have them, PoodLL Filter, Generico, Video Easy, Streaming media filter (RTMP). I suspect
Lesson
Lesson Activity :- Insert a link to video
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