Missing label is showing constant.

When a user proceeds to update their membership, this is displaying:
"Please enter information on the form below to process the renewal of your subscription for Membership for [NUMBER_DAYS] days."

The number of days are not showing up, but are set in the CMS.

That tag [NUMBER_DAYS] is supported. I don't know why it is not replaced properly on your site. Maybe there is some special characters inserted into the tag and it causes the issue. You can submit support ticket and I will be happy to check it for you

Tuan