Message storage size showing incorrect

im fairly sure this has to be a bug. my messages under manage storage is showing as 49GB of usage. I have gone to settings -> manage storage -> messages I see the top 20 conversations are using up 9.5 GB. I have a few long time friends who are eating up a few GB of space and then on average the conversations in this list of 20 is around 200MB. The lowest is 60MB. That means I have other conversations eating up 40GB of space. Without actually counting the number of conversations I scrolled through the list and tallied up about 10 conversations per page as I scrolled through. I have about 300+ conversations. this literally means I would need 600 conversations with over 50mb of images. Now even if I severely under counted the number of conversations 25% of these are like from uber sending me a code. Is there a way to dig deeper? How do I open a bug report. I’m having to pay apple extra monthly to pay for more cloud space I don’t need!