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I hope that was communicated clearly, but basically after drafting a comment, if I decide to edit something and click the "edit" button, begin to type a sentence and then promptly change my mind and hit "cancel", the post still seems to keep/save that partial edit instead of reverting back to how it originally was before. So essentially I've had to catch myself and make sure I fully delete whatever I've partially typed out regardless as to whether I choose to click "save" again or "cancel".
I can't speak to whether this happens only on mobile or desktop, or both, and whether it's a consistent thing or not as I haven't been paying that close attention. I'll try to do some exploring.