If you create an Ancestor chart in PAF 4.0 it uses Ahnentafel numbering.I just made one and here's the description on the page:
"The ancestry report uses 'Ahnentafel' numbering. This means that the numbers for a person's parents will be twice as large as that person's number. For example, if a woman's number is 15, her father will be number 30, and her mother will be 31. Her child will be number 7."
The other web pages don't use that numbering, only the ancestor chart.Hope this helps.