I managed to replicate the stretch issue on my personal SharePoint site due to the sensitive nature of my work’s site. I mocked up a similar layout and structure of the worksite using dummy data. Notice image 1 (in Edit Form) this is the normal layout. If I click the Request Tab again it stretches the form/headers (image 2). If I keep clicking it multiple times notice how the form/header continues to stretch (image 3).
I also tried to replicate the {author} issue I was having above the tab section however my personal site uses first last name format as opposed to Last, first name. In the users name I looked up, from work, they didn’t have any commas originally in their name except for what exists in the “Last Name, First Name” format used.
Let me know if you need anymore info and/or have any questions.
