Calculations are not working

About a month ago I had a long string of difficult help threads regarding my form calculations which were not working. After a lot of back and forth, and some inconsistent results from testing, I was being assured that the form was working fine, so I went ahead and launched it. Now, however, I am again having the same issue in real time. I am hoping that someone can take a careful look at my form to see where the issue might be, to eliminate this problem entirely. I appreciate your help in advance.

Here is the sample situation. If you can please look at the details on the submission for "M. Virdo" for the form indicated below.

You'll see that she selected the Approaching Grade One course, and then apparently she also selected a Beautiful Drawing course, but then changed her mind and DE-selected it.

The problem is, that when she selected the 2-day course, it offered her a 2-day course discount (it made a 2-day discount calculation), but then when she DE-selected the course, the discount calculation did not disappear, and so her registration was submitted with a $25 discount that is not valid.

(This means I will have to contact her for payment of the $25, since she should have been paying the full amount.)

I need this form to recalculate according to the whatever selections are made in the end, no matter how many times a participant might change his/her mind before hitting the submit button.

Can you help me correct this so it doesn't happen anymore in the future? 

Thank you very much!

I have cloned your form and I will try to replicate the issue and find the solution to the problem. I will get back to you as soon as I figure it out.

I could not replicate the issue at all in my cloned version:

Not even in your form:

Have you done something? Can you please try it in your end?