Lines after chapter title

Hey guys,

I’m new to this forum and Scrivener. I’ve been working for a few days on my manuscript, reading and watching all there is about Scrivener, but I have a problem after the Compiling that I can’t seem to get rid of. When I preview my manuscript in Kindle previewer (and I checked it myself on my own Kindle) two straight lines appear after the Chapter/Section title. I’ve kinda gotten used to it, but I’m still curious is there any way to get rid of them? I’ve attached how it looks like so please advise.

Thank you,