No worries! Let's see if clearing the app caches help! Head into Settings > Apps > 3 lines next to Your apps > Show system apps > Search for Dual Messenger > Storage > Clear cache.
Follow these steps for the other apps. Once you've done this, please restart your phone.
Its a bug with the dual Messanger. At this time there is no chance to change it. We must wait on Samsung.
Whatsapp change there Storage Space on the Phone.
Please send in an error report in the Samsung Members app, so our engineers can get a better understanding of this. To do this, head into the Samsung Members app > Get help > Error reports > Others > Fill out this form. Once this is sent off, our colleagues will get in touch with more information once an engineer reviews your query.