Form calculation field is showing formula instead of calculation result

I had to redo some fields and thus redo two form calculations.  

Now the calculations do not work including the default value of "0".

I guess I have done something wrong, but can not find any "helps" to help me.  

Can you suggest something?

Thanks,

Christina 

There is a comma symbol which is affecting the calculation, please remove it in order to fix the issue.

If you need any further assistance, please let us know.