Selecting Clips, adding keyword, selected clip not showing up in keyword collection

I am having issues while editing a soccer game for a highlight reel. I have done this many times without issue, but with one project, for certain keyword selections, it is not showing up. I am selecting a clip from a longer piece of game footage, then hitting command-k to open the keyword collection shortcut interface. I'm inputting the keyword into it and hitting return. It makes the sound like the clip has been marked as a key word, but when I go into the keyword collection in the event history, the clip is not showing up. Again, this is only occuring in one project and hasn't been an issue in the 10 other similar projects I've done. Any thoughts? Is there any way to fix this recoding the entire game? Thanks.