Problem with form.post

[RUDIWER]

I have a form with 2 file download inputzones in it and a array of input fields. (So 3 arrays) Everything worked fine until i added a extra download inputzone.
So now i have 4 arryas in the formData (features / fileArray / docArray / dropBowArray)

Since i added that extra file download input zone (dropBowArray) not all arrays are posted to the server ??? After check the formData it seems all data is in it client side but on server site some of the arrays are dumped? I even tryed to add the arrays to the form with form.transform but even then when posting them they are dumped? Even the arrays where not any change is done. (ex. features)

Here are soms screenshots:

This is de data in the form before submitting when i did no action on the form (Openthe form and submit it)

Here we see the arrays features / filearray / docArray / dropBoxArray

When we submit this form we get this result in the response

Everything is fine all arrays are in the server side data

Now i open the same form and add a file to one of the(download zones) I do nothing else in the code just download a file to the form.

This is de data in the form, all data is in it and everything seems to be ok:

But when i look to the request data server side:

The array with features and the docArray are no longer in the server side data? I did ot change anything on those array's

What can be the reason that i loose these arrays in my server side data, eveb when everything is still in the client side data?

This issue is started when i added a 4th array (dropBoxData) but it happens not only on that field even when i download a file with the other downloadzones it happens. When i remove the 4th downloadzone(array) everything works fine again???