Describe the bug
Round brackets are interpreted as Markdown links even with no square brackets in sight.
To Reproduce
Steps to reproduce the behavior:
Text with (parentheses)Expected behavior
Visible parentheses, no italics, nothing clickable.
Actual behavior
Parentheses hidden, text in italics, clicking moves selection highlight.

Desktop
You should disable "Preview MathJax"

I would argue it should be off by default.
That helped, thanks!
I agree that MathJax should not be the default. And even after your hint I looked for it in preferences (where Marked has it), not the View menu.
Now disabled by default
Most helpful comment
Now disabled by default