Your suggestion did not resolve the problem.
I resolved the problem by creating a new column and performed a measure from 2 other 2 other columns that calculated the percentage (that was already in the data) and that resolved the problem.
I also had to set the value (in the visual with the percentage) to average, and that did the job.
I guess I have to look at the source data to see what is the base of this.
Thanks for your time and effort.