I have this issue when I add different field options to an event - the price at the top of the registration form does not show when I add certain fee-based fields.
I have a checkbox that deducts $75 from a $100 event - it works when I check the box and the displayed price at the top of the form changes.
I have a drop-down with two options, one adds $40 to the registration - that works, too.
But then I have a multi-checkbox field where the user can check as many of the options as they want, each adding $500 to the registration. I also have a drop-down that allows the user to choose one of 18 options. When either of those fields are enabled, the price at the top disappears on the form, so the user can't see the effect of the options they've chosen.
I've seen this on other sites I manage, but I just tested and realized that this seems to be an issue. (DT Register 4.0.9).
Thank you,
Ernie