Hi Evseychik,
I triggered an email from the flow using "Send an email (V2) action" it renders as expected without the huge space between the purpose and the table (please see the image below from outlook).
The space only appears when creating the ticket gets created.
The html i posted on the original post is collected from a flow that is already ran and yes the styling also gets disappeared on SharePoint but it shows fine in the ticket email on the outlook.