Worlds Missions messed up??

I'm not sure if this is a bug or I just don't understand something, so please someone help!

The Worlds Missions came out a week or two ago, whatever it was. There were a couple of missions to do, so I did them. Then, I bought Championship Ashe and realized I could get that awesome Gold Chroma and ward skin, so I wanted to do a bunch of missions to get that reward. I bought the "Worlds Master Pass" that gives you two new missions to do, as well.

So the problem is, now I have this mission in my list that says "A Real Challenger: Complete 4 more Worlds Missions." I've completed 3/4, but there are no more in the list and I can't seem to figure out how to trigger more missions to show up! What can I do? I only have 75 coins from the original missions and I can't progress any further???

Thanks in advance!