User blog comment:Dragonjet/KC3改/@comment-112.200.67.7-20160106152256/@comment-26091666-20160107023635

Most likely it was permanently deleted or the data had been overwritten with null/zero data and hence effectively has no historical records.

This could be because of poor network/internet connectivity that is able to somehow corrupt extensions. Other than that MiTM is also likely depending on scenarios.

On a minor note even if it maybe irrelevant is that if you proxy chain KC3 Kai with external proxies such as shimakazeGo or OOI2 for instance it will also stop revealing historical information on graphs, etc. That is because of the way those external proxies are set up which effectively prevents KC3 Kai from accurately obtaining the data.