@nsm - There’s an alignment issue with code in the theme (line 255 currently). Didn’t notice it until you pointed it out, but now it bugs me enough that I wanted to fix it myself.
@kognise doesn’t seem too active here, so we might not get a permanent fix. Meanwhile, here’s a snippet you can add to correct things. This removes the alignment from all lines that have code in them.
.markdown-preview-view code {vertical-align: 0;}
Hope that helps!