Data disappears when editing a row on an editable list view, when it contains a picture control as the first column.
Data records will disappear only if you add the picture control as the fist column of the list view.
This is identified as a bug when using picture control on a list view, K2 Labs are currently investigating this issue.
As a workaround:
Include the picture control anywhere in the list view, except adding it as the first column.