we are using content query web part for display on all site project task data. it is working. but it is not working filter in assigned to column. Also under Title of task displayed <div></div>. how to solve this issue? ex: 388 SpeedStep Intern - Class no. and add new course <div></div>

Did you customize it at all or is this straight out of the box?

customize the fields

Keep in mind I am not a programmer, but I know when working with XSL, to avoid HTML tags showing on the rendered page you put disable-output-escaping="yes" perhaps there is something for that that you can put in your customized fields? If you don't know for sure or are unaware of the syntax, hopefully someone more knowledgeable than I will jump in, but I hope this gets you in the right direction. As for the assigned to column -- What type of column? If it is a lookup, then it won't let you filter by that column.