Favorited videos not going into collections even after manually adding them

Apparently this has been happening for like a month now but I only just realized it. Whenever I favorite a video and add it to a collection, it doesn’t show up in the collection anymore. They save to the overall favorites posts tab, but I can’t get them into a specific collection folder unless I open the folder and manually try to scroll through everything to find the videos I wanted in it. Is anyone else having this issue?