Hello Z_SilenceMoon,
This is a known and reported issue UE-19590, and we appreciate you taking the time to report this bug. Once the issue has been addressed by our engineers, the fix will be added to the release notes for fixed issues within an upcoming full engine or hotfix release.
For now you will need to select and move these curves individually.
Let me know if you have further questions or need additional assistance.
Thank you,