checkbox custom bug in email

Hello everybody,
I came up onto this bug, have you experienced this before, or have you any idea how to fix it?

I use custom checkbox in a format:
[checkbox_custom sunday “6|lunch (6€)” “6|supper (6€)” “30|bed and breakfast(30€)”]

Frontend looks ok, but I have problem with email sent to customer and to myself. In both I made setup for reviewing order with tag [sunday]

The problem is, when user checks lunch and supper, instead of getting in email lunch 6€, supper 6€ he gets lunch 6€, lunch 6€.

I’ve tried to change the price and the value of supper for 7 and everything worked fine, but I need to have 6€ price for both (and the value that is calculated in the form needs to be the same 6 for lunch and 6 for supper).

Have you any idea how can I fix it?

Thank you very much.

The page I need help with: [log in to see the link]