Early Bird Discount Error

Hi, I was trying to set up an early bird discount but it seems to be calculating incorrectly. The discount was 50.00 and the original course fee was 300.00. It works fine when booking 1 person but when booking 2 or more it give the following:

Course fee: 600.00
Discount: 50.00
Total: 250.00

Has anyone any suggestions on how to fix this?

I also posted earlier about the "Event Location" being inserted onto the confirmation email. I was wondering if there was any update on this.

Thanks for your help