Some custom fields not showing

Hi guys, i have a question.

Ive made two groups of admin fields for our products. The first group is showing just fine, but the second groep, which contains 7 fields, is just showing one.

In the link, you will find a test product with 4 custom fields, 3 from group one (all good), but just 1 from the second group. Settings for both groups are the same.

The fields (6 text and 1 number) are all filled in the admin area, so that cannot be the issue i assume.

Any help will be much appreciated!

thanks!

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