I don't know if you know about this issue. If I put a discount on the charges page and save it, it goes to the bottom of the invoice under the taxes. It looks fine and charge is correct but if I go to change the quote again, it includes the other items above it in the discount including my fees. I don't know what it's actually charging if someone books... if it's the discount on just the rent or the whole booking...
We just overhauled the tax system, and it looks like it's interfering with the quote charge ordering. The total should be fine, and bookings are fine. I'm looking into this as we speak and should have a fix out shortly.
This issue is now fixed.