When assigning a book to a clubber, there is an option of which awards to trigger. Set the Award Set to "Emblems" (default) to trigger the Chevrons, to "UC1 Emblems" to trigger the first set of 8 UC Emblems, or to "UC2 Emblems" to trigger the second set of 8 UC Emblems. If the book is already assigned, edit it and update the Award Set as needed.
Also, if the Award Set needs to be changed after incorrect awards have already been triggered, deselect/unmark the handbook section(s) that triggered the award(s) to delete them. Then with the Award Set corrected and with the correct Current Club Date selected, reselect/mark the handbook section(s) to trigger the correct award(s).
Hint: To correct multiple dates when incorrect awards were triggered, use the Windows App to make the edits. It allows you to explicitly set a section's completion date instead of needing to change the Current Club Date before marking a section as complete.