Lds Account/gospel Library

So on gospel library on the phone one person had all this markings and annotations logged in on his lds account, and he signed out, but we kept all the markings and annotations.. And so I came along and signed into my lds account on that same phone.. And all those markings and annotations jumped onto my lds account.. But that's not the worst part.. It seems as our lds accounts merged or something because everytime he marks sometime on his lds account on a new phone it goes to my phone and lds account.. So how do I unmerge the account or what do I do??

Did you verify that both of you are currently signed in with different LDS Accounts on the different devices? I don't think it's possible for annotations to cross between LDS Accounts when properly signed in. (The first part you describe is definitely possible – signing out, keeping the annotations, and signing in with a different account, and the annotations being copied over.)