Since they only had up to 180 tier, I think they simply "forgot" to upgrade the maximum time you can have once they introduced the 270 day tier.

So, SE, could you please get to it and update that setting ?

It makes no sense how it is set now, unless you have a mid-way changed policy, since you can get the 180 day from day 1 but not the 270 one.

Thank you.