Greetings! IIRC, the font size of the cookie names used to be larger. (Or, maybe my eyes are getting worse since Cookie 5 or early 6! 
)
Hope there's a way of enlarging them. If not, please consider adding that option! It'd be nice if they were at least as big as the text in the Removal Options window...
Thanks for the confirmation. The problem still occurs even with Caches UNCHECKED! I end up force quitting the Safari Networking process from the Activity Monitor or simply quitting Safari.
So, it seems that Cookie is no longer implicated -- at least not the Cache setting!
Any other ideas of what could be causing this? Is there some known Safari glitch that does this?
By the way, I'd suggest changing the wording under the Unwanted Data tab. I'd recommend adding the phrase "Non-Timer" so it would read "Select Unwanted Data for Non-Timer Automatic Removal. (See Timer Options tab for those choices.)"
That would clear up some of the confusion, although it doesn't solve the run-away Safari Networking!
Having the very same problem under Mac OS Mojave and Cookie version 6.5.3. My 2015 MacBook Air is heating up like crazy, battery life has gone way down, etc.
Activity Monitor shows Safari Networking going crazy -- 110% CPU, etc.
Console shows "Failed to store registration data into records table" repeatedly appearing.
Had hoped that the latest version would fix this!
I am confused on one point, however. Do I uncheck Caches under "Unwanted Data" or under "Timer Options"?
It sounds as if it's the one under Timer Options. Or, is it both?
Look forward to hearing back. Thanks!