Weight Definition suddenly missing

Hi, we are working on a small project using the Functional & Logical Design app. Therefore we needed to assign materials to all parts. We did that and everything was working smoothly. But then yesterday, without us changing anything, there seems to be a problem with the weight definition (all suddenly missing) and we are not sure what and how that happened. Attached you can see the previous state (green, blue colors) and the current state of our assembly (red color). Can you help us here? Kind Regards