Adding unlimited DVR to legacy Go Big account

I have one of the legacy Go Big accounts. Over the years the price has gone up and it's now at $89.99/mo. with the 20 hours of cloud DVR and free HBO Max from AT&T.

I want to add the unlimited cloud DVR but when I do that on the confirmation page the monthly charges list $114.99/mo. current and $99.99/mo. new and the base package of Go Big as $114.99/mo. for both current and new.

Before I submit, is it going to actually charge $99.99/mo. or will it bump up to $114.99/mo.? I think it will be $99.99/mo. but seeing the current charges being $114.99/mo. makes me wonder this will mess up the legacy account I have.