Emails look broken for some recipients
If a notification or note looks fine for some recipients and broken for others, a custom font is the usual suspect. Some email apps can't display fonts they don't have, and the message falls apart.
Switch the text to a standard system font like Arial and send again. If you pasted from another document, paste as plain text, then format in the text editor.
Still not right? Send us a screenshot at support@theemptyspace.com.