When adding HTML to section and save it’s automatically removing some code and adding some p br tags and breaking structure. Is it can fix in sections?
The WordPress editor (which Sections uses) will do that to some HTML, especially if it’s not valid HTML/there are empty elements.
Have you tried using the new Gutenberg editor? Our new GenerateBlocks plugin (https://generateblocks.com) is like Sections on steroids. Might be worth trying 🙂
If you need to use the Classic editor, you might just need to adjust the HTML you’re using. Any invalid HTML will be stripped, and empty elements (<span></span> for example) will be stripped.