Widget issue : Post Type

Hi
Thank you for the great plugin

I installed it on several websites and on each I have the same issue.
When I try to update the plugin settings, everything is fine except for the post_type
Whatever my choice is, the last available post type is selected and I can’t change it.
I tryed to deactivate all my other plugins or reverse to a default theme and the bug is still there

Thank you for your help