Radiation levels seem to be on rise and have maxed out sensors in Chernobyl. Can anyone tell whats happening?

Edit:

Snapshots: https://web.archive.org/web/20211029005305/https://www.saveecobot.com/ https://web.archive.org/web/20210922063854/https://www.saveecobot.com/en 74 snapshots since 2018. The specific radiation map has been snapshotted yesterday only which seems concerning.

Snapshotted about page: https://web.archive.org/web/20210301011105/https://www.saveecobot.com/en/static/about All people here seems legit.