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This sounds like an issue with the email rich text editor while composing, not only the final email rendering. I would first check whether the issue happens only when replying with a specific email template, signature, or content block, or whether it also happens in a completely blank email.
If it only happens with certain templates/content blocks, inspect the HTML. Hidden formatting, copied Word/Outlook markup, unsupported CSS, nested spans/divs, or invisible characters can cause strange editor behavior. Microsoft has documented cases where email template content appears out of order because of invisible characters in the HTML, especially around formatted content. A good test is to recreate the template/content block from clean HTML or plain text and add formatting back gradually.
If it also happens in a blank email, then I would treat it as a browser/editor issue. Test in Edge and Chrome, clear browser cache/site data, disable browser extensions, and confirm whether all users are on the same Dynamics 365 app version and using the modern rich text editor. Also check whether the email form is using the recommended Rich Text Editor control rather than older/deprecated email/activity editor behavior.
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