Appointments+ will not display the real price in the notification.

Since I upgraded appointment to pro, it has not been able to display the real price in the notification send to the customer by auto confirmation.
For example: the price 1,500.00 appears 1.

I have uninstalled it at all, and deleted all files through ftp client (filezilla) and have then reinstalled and activated the plugin, but the same error appears.

Please, let me know how can I solve it.