I have found a strange behaviour when defining global colours in Designer. There are two odd behaviours shown in the uploaded video:
If selecting multiple filled objects and using the 'Add current colour to palette as global colour' button in the swatches toolbar, only the first colour is added to the palette (00:00 - 00:10)
Selecting multiple objects and using the contextual menu 'Add to swatches… > From fill as global' adds multiple fills to the palette but when you try and edit the second colour, the first colour is changed (00:33 - 00:43)
I can replicate this on a new document and it behaves like this for 2 or more colours selected in in one go. Subsequent colour selections and additions seem to 'group' themselves together, e.g. if a palette has 2 existing colours and a further 3 colours are added. Editing colour 5 will result in colour 3 changing.
I am running Designer 1.7.1 on macOS 10.14.6. Please let me know if you need any further info on this issue.
Screen Recording 2019-07-26 at 16.28.08.mov