Hi,

Logout of your instance, log back in, go to workflow activity in back-end navigation, then ensure you click on the "Checked out" tab and click your workflow there. Sometimes if you're impersonating people or the system thinks you're logged in as someone else, etc. the workflow will show under published tab, but then say checked out by me. You need to re-check it out again or click on it under checked out.

Please mark reply as Helpful/Correct, if applicable. Thanks!