Odd changes to Keychain all modified same date (Four entries per item - different kind of entry) - Hacked?

Hi I just noticed while trying to update a password for a website and getting an "invalid token" response and also having some other issues with my iMac being slow some very odd entries in my passwords section of my keychain. The entries all have the @ sign in blue in front of them for iCloud and I do not recognize the ones that are listed multiple times such as Engram, Manatee, Home, Health, Limited Peers Allowed with - they each show up with kind of entry as tlk non sync, tlk, classA, classC. So, each of the above entries is listed four times i.e. Engram - tlk, Engram -tlk-nonsync, Engram-classA, Engram-class-C and the same for the others. I have not seen this previously and would like to know if I should be concerned, if there is something I should do about this, and what. I have EtreCheck and I ran it the other day and everything was fine. I did not run it today, but I did have some issues trying to shut down or re-start my machine - I believe that was due to Windows running updates in the background and I did receive a message stating my security preferences were downloaded (presumably from Microsoft's website to my Mac)?, but the date does not coincide since that was this morning and the changes are dated five days ago. Does anyone have an idea of what could be going on here? Any help would be much appreciated. Thanks, L