Here's what my account options look like right now. The 1-year option is greyed out.
Flickr_Account by rlriii13, on Flickr
Here's what my account options look like right now. The 1-year option is greyed out.
Flickr_Account by rlriii13, on Flickr
I think it greys out your last subscription plan, since this is to switch to a different billing interval. I signed up for a 2-year plan, so if I go into mine, it shows 3month and 1 year available, and 2 year greyed out. I take it yours will auto renew on at the 1-year Pro plan.