<human>: Can you provide a brief rundown of the text in within 3 sentences?

Hello lovelies! This may be obvious to some of you but it was not to me, I solved a mystery today and I thought I'd share my findings here since I'm sure I'm not the only one who has been confounded by a totally random purchase showing up for something that was never on the registry and makes no sense.

I checked our registry about a month before our shower to make sure I had enough variety for the number of guests and noticed that someone had purchased vacuum cleaner bags for a vacuum we did not own nor register for since we already own a nice vacuum. I shook my head at this folly and wondered how to appear gracious when opening up such a strange gift. The shower came and went (huge success btw, yay!) and no vacuum bags. I was relieved, but confused. I shared my befuddlement with a few coworkers this morning and lo and behold, it turns out my coworker bought the bags for herself at the same time she bought my gift and they just scanned both items as purchased for our registry! Elementary, my dear Wedditors, mystery solved! No need to feign appreciation or deal with returning random vacuum bags, guys! Woo!
<bot>: if a guest buys a gift listed on your registry and also buys themselves something, unless the transaction is separate, all items will show up as purchased for your registry.