Problem with Bookmarks on Chrome

I have two laptops that are sharing the same bookmarks incorrectly. I am using Google chrome. I logged into my account on one laptop (call it laptop A) and now I am on another laptop, (call it laptop B) and I am signed in as a completely different user. I am sharing the same modem/router connection. Now, whenever I make changes to bookmarks/favorites in laptop A, it makes identical changes to Laptop B. What is going on?

you can “sign in” to Chrome itself, and it will sync all bookmarks, extensions, history to any installation of Chrome you sign into. You can go into “Settings”- “Advanced Sync Settings” and choose what you want or don’t want synced.

ok thanks