Maybe this is also what it happening to me...
I added a new field type and it is really acting strange...
Sometimes it is showing up in three places when I go to add child.
I edit out the new field and it may or may not show back up..
Latest problem is happening today.. The new fiels is a check box and when a new product is added the check boxes accept the check mark. When the product is saved all of the check boxes show up on the product but they are greyed out and nothing is checked...
Tearing my hair out here
Not much left
Here is a screen shot... the one field is showing up 4 times.