Calculating average contact area

Hello

I am trying to evaluate the average contact area when two particles contact each other.

I have defined a custom property called as contact area accumulator and a counter

but when i print out the values of the accumilated area it does not accumilate the value. I am using cuda api

In lines 1,2,3 the value in the first column should have got accumulated in the second column and also the value in the third column should have changed from 1,2,3…. like a counter.

Can anyone please tell me why this is happening?