Hello Geert,
Sorry that there has not been a follow up on the forum.
This issue was solved through email, where it turned out that the definitions of the track are correct in AnyRail.
In fact, it's a well known problem that the Fleischmann curved turnouts do not fit as well as the catalogue suggests.
A little wiggling is necessary to make them fit in the real world as well. In AnyRail, you can simulate that by switching 'Snap dropped parts' off (in the 'Tools/Options/Behavior' window).
Afterwards, simply rotate the turnout by 1 or 2 degrees, and it'll fit perfectly.
Because this is a bit tedious, we have put some examples on line, from which you can copy and paste what you need for your own design. Remember that you can start AnyRail twice, and copy and paste between them.
The examples are here:
Fleischmann Piccolo curved turnouts examples.
David.