@KayleeSC I've been having the same issue for over a year, at least.
Just today I got a reply to one of my bug reports. This time, instead of just clicking on the "Add More Information" button at the end of the report, I clicked on the "Reply to Apple Feedback" link at the bottom of the reply from Apple. After submitting the requested information, in this case confirming that the issue is now resolved, the report still had the purple dot next to it. But as soon as I closed the report (which was appropriate in this case), the purple dot disappeared and the feedback moved from the "Requests" folder back to my "Submitted" folder.
So yes, this is a bug in Feedback Assistant. You really should file a bug report on this.
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Developer Tools & Services
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General
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