@Melina111
For new listings you have the option to offer 20% discount for the first 3 guest to make your listing more visible and attrat guests and first reviews . as 72 is 20% less than 90 I'm guessing this is what have occurred. I'd go into your settings and ( booking settings) and increase your base price by 20% rather than cancel the special offer as this involves an email being sent to people and extra pubilcity for your listing