@jonathanobi Thank you for sharing all of the information. If the data in Site Kit matches the data in your Analytics account then this is unlikely due to an issue at the Site Kit level. I can see as I mentioned above that Site Kit is successfully placing your Analytics code for you and the tag is firing so that all looks correct to me.
I did notice that as well as using Site Kit for Tag Manager that there is also reference to Google Tag Manager for WordPress by gtm4wp.com. If you are using Site Kit to place Tag Manager code then we advise that you don’t use any other service to do this as well.
Has this been a sudden drop in your Analytics stats or has this been since connecting Analytics in Site Kit? I’d also suggest asking a question on the Analytics Help Center as we are limited to Site Kit support here but I can certainly run some more checks here to see if anything obvious stands out from the Site Kit side of things.
If you could share a recording with us of this all then that may help us to better understand what may be happening here. Feel free to share that on the previously submitted form.