Data does not show up in Edit mode and does not show right data in View mode

Guys,

I try to use the multigroup / CCK3 module. However I get some unwanted results. When I want to view the node, data has disappeared.

I will show you an example.

I have created the following contenttype:

Group1 group_1 Multigroup
Test1 field_test1 Text

So I have a content type with a multigroup in it. The multigroup contains a textfield.

I create a new instance, where I enter text in three fields (see screenshot)

http://dl.dropbox.com/u/1397394/test/capture1.jpg

Two different behaviours show up:

When I view the node the first time, the data dissappeared. I see an empty node. When I edit the the node, it's also empty.
When I view the node the first time, the first set of data is repeated:

http://drupal.org/files/ViewMultigroup.jpg

When I edit the node I see:

http://drupal.org/files/EditMultiGroup.jpg

While I used two rows to add values.

Any ideas on this one?