Hi Jeffrey,
When selecting elements for grouping, there are some items that are not able to be added to a group. Drafting Lines, Text, Dimensions, and Room Regions are the elements that are not intended to be added to a group. I can see that you have either Text or a Room Region added in, which is the 147 SQFT.
If this does not fix the issue, please send the file to support so that we can look into the elements that are added.
Thanks Jeffrey,
Nick