Only 1 Subscription Plan is being added. I need 2.

I have a monthly subscription plan in place. I want to add a yearly option. I have tried, several times now to add it in, but it just doesn't show up in the Subscription Plans list.

Before trying to add it, I did go in (on the advice of another question in this forum) and changed the file so that the maximum price option is now $1300 instead of $300.
Would this have affected anything?

Thanks,
Emma.