hi, with 3.1.4 we observe 2 phenomenons with the form layout:
1) the selected categories are not shown in the form list (see screenshot bug_form_layout_cp314.jpg). In version 3.1.3, the same form shows correctly (see ok_form_layout_cp313.jpg).
2) even if you only tick a few categories, the form picks ALL (in addition, phenomen 1 shows here as well).
So you cannot set up your individual forms any more.