Having a strange reaction with text

Question

I was writing a reply to someone who ask a question on my site and I put a word in in between the right and left arrow keys < >  to make it stand out and when I did it actually made the word invisabale so you could not see it But when I wen to edit it they I could see the word...

Comments

What editor is your site using?

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Markdown Editor v2.5.1 by Scott Vivian

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on the options I have
Don't add CSS inline     Tick if you added the CSS to your own stylesheet (more efficient).
Plaintext comments     Sets a post as plaintext when converting answers to comments.
Use syntax highlighting     Integrates highlight.js for code blocks.