Personal hotspot usage stats incorrect (please hear me out)

Hi, after searching for my issue but pretty much only finding folks complaining of getting over-charged for data they SWEAR they didn't use, I figured I'd ask here.

My issue is that in the past 3 days (when I reset my current period) my iphone has steadily increased the overall cellular data usage stat in settings, specifically showing over 14 GB of hotspot usage by "Other Devices." To provide some context, my average monthly data usage is usually around 10-15 GB. Additionally, in these 3 days, I have only knowingly used my hotspot once for about 2 hours while I did some work from the car and then watched prob 30-45 min of YouTube videos on my laptop. I would have guessed I'd used around 1 GB or less during that time.

Here's the fun part. My mobile carrier agrees with me, and their stats show me using a total of 1.45 GB of data in these same 3 days, with a little under 1 GB in hotspot usage. I figure if anyone is going to be sure to tally every last MB I use, it's going to be my carrier. So what gives? Any ideas on what could be causing my iphone itself to think I'm using nearly 14 times my actual data usage just on hotspot?

Thanks!