I’m having this issue with a Onestar where the string is going in between the bearing the the yoyo itself. Yoyo is screwed on correctly and bearing is sitting correctly, but there is just a gap there where the string goes in when I throw. Makes the yoyo unplayable.
did you switch the bearing? if you tried switching the yyf out that could be the problem. yyf bearings are flat all the way to the edge and a yyj or one drop bearing has a slight curb down at the end. same thing happened to me years back