The CM is correct..... your count down ticker says 3 months, but not every month has 30 days..... it is exactly 90 days that you can book, not 3 months. Here is an ADR calculator you can use to find out what day you can book:
http://pscalculator.net/pscalc.php
If you check in on July 18th, you can make ADRs on April 19th.