I had that. Go to the top line (where it gives the price) and a drop down gives you lower tier and upper tier. Select upper tier. Looks like the lower tier has already sold out.
10+. The original dates published were all pushed back a day.
They always take them off sale overnight when there's going to be a points change happening.
I've just got 3, 2 of which were season ticket holders with 0 points