This is what Lemmy sees when it pulls your Mag through:
"name": "progresspics",
"title": "Post your progress!",
"description": "Show off your hard work! (Not limited to just weight loss) \\*\\*Use this format when posting pictures:\\*\\*\n\\\\\\> \\*Gender/Age/Height [Weight Before \\> Weight After = Total Amount Lost] (Time period in months) Personal title\\*\n\\\\\\> \\*Example: F/23/5'5\" [289lbs \\> 250lbs = 39lbs] (4 months) I am very proud of myself!\\* \\*\\*RULES\\*\\*\n\\\\\\> Be respectful\n\\\\\\> Support one another\n\\\\\\> No sexual comments \\*(based on the subreddit)\\*",
As you can see, all your markdown is being escaped like crazy.
I don't know what the solution is.
It doesn't help that KBIN uses slightly different markdown than Lemmy (e.g. underscores for italics on KBIN, asterisks for italics on Lemmy)