I'm posting here because it's similar to my issue. I'm not sure if this is a bug, or a lack of feature, but when creating a new template, entering existing tag names that have more than one word, Diarium splits that tag in two for the template. So if I want to use the existing tag 'My family', the template will split it up into two new tags 'My' and 'Family' leaving me unable to assign that tag to the new template.
Diarium version: Latest
OS + version: Windows 10, Android