When adding a copy tag to an item in the copy editor a new tag is being created that adds the shortname of the working location of the workstation to the tag.
To duplicate do the following:
1) Create a copy tag type and tag: Type = Bookplate, value = 'In Memory of Richard', Owned by any library. In for me it was Branch 1 (Shortname = BR1).
2) Edit any item click on the Item Tags button
3) In the Manage Item Tags window Select Tag Type = Bookplate.
4) In the Tag box start typing your Label of In - you will see a selection of tags and the owning lib of that tag in parenthesis. For me it was 'In Memory of Richard (BR1)'
5) Choose your tag and click the Add tag button.
6) in the Editor click on the Save & Exit button.
You will see the tag added was not the original tag of "In Memory of Richard" Evergreen created a new tag with the tag type = Bookplate and the Label and value both equal to "In Memory of Richard (BR1)".
If you attempt to add that tag to another copy the new tag you see the following selections: "In Memory of Richard (BR1)" and "In Memory of Richard (BR1) (BR1)" in the tag drop down box. If you select the first no new tag will be created but if you select the 2nd option a new tag will be created with "In Memory of Richard (BR1) (BR1)" as the label and value of the record. A third attempt to add that tag to another copy and your selection will be "In Memory of Richard (BR1)", "In Memory of Richard (BR1) (BR1)" and "In Memory of Richard (BR1) (BR1) (BR1)" ect...
If you add a tag owned by another branch for for example the "In Memory of Richard" owned by the System (shortname = SYS1) the new tag will be ""In Memory of Richard (SYS1)" but the owner of that tag would be the branch of the workstations. Which will show up as "In Memory of Richard (SYS1) (BR1)" when you go to add it another item.
Affecting SPARK libraries. One library reported they first noticed it happening after Feb 19 2019.