Sorry Jos, I wasn't clear what you wanted.
The "relative" button only calculates the distribution relative to the entire total of the expression. This is equivalent to
In this case your chart is calculating
[cumulative apples] / [total cumulative apples and bananas] as a %
resulting in the unusual total %.
To fix this, you need to do the expression manually, then divide by the total of just the fruit. To do this, use the <> brackets after the total to total by just the type of fruit.
Untick the relative box, and enter in
=count(my_product)/count ( total <my_product> my_product)
as the expression. This should solve your problem.