Is Percent Cached 100% a reporting issue?

We saw a sudden increase of “Percent Cached” from 34% to 100% and we haven’t touched anything related to caching.

Check the screen grab here (I can only upload 1 image so I merged the analytics from both pages):

As you can see in my screen grab there’s a huge jump and it’s consistent 100% even after we purged cache. But if you check the Cache status only few are “Hit”, and most are “Dynamic”, and “Miss”.

Is this a reporting bug or is there any explanation for this that I missed? Our concern is that if it’s really caching consistently 100% without dropping, then users or crawlers might not see the changes that we’ve made recently and see old content instead?

Caching Setup:
Caching Level: Standard
Browser Cache TTL: 1 day
Caching Rules: None
Tiered Cache: Enabled
Cache Reserve: None

Others Related:
Argo Smart Routing: Enabled

Origin Server Caching:
Images, JS, and CSS files
Cache-Control: public, max-age=31536000

HTML files
Cache-Control: s-maxage=60, stale-while-revalidate