Problem buying Season Pass

Last week, I purcahsed the first two episodes of "Agents of SHIELD" by hitting the button that is normally the Season Pass button. I didn't realize at the time that there wasn't yet a Season Pass.

They just added a Season Pass but when I went to complete my season, I found that the button for the SD version says "Purchased" even though I haven't yet purchased it.

Can anyone help me solve this problem?

Thanks,

Mark