When working in a score with copyable Staff Styles, such as Slash Notation or Rhythmic Notation, users may encounter a known issue where Staff Style assignments are unshared between score and parts. This can result in a Staff Style being copied in the score, but not copied into the linked part. If your existing linked parts lack the staff style after being copied into the score, follow these steps to amend this:
1. Select the Staff Tool 
2. Select Edit > Select All... All the staves are highlighted.
3. Select Staff > Use Selected Staff Style for Score and Parts. The Staff Styles in the score are now reflected into the parts.
If you are still experiencing the same issue after trying the previous instructions, please use the Submit a Request option above to contact Customer Support.