I am not quite sure what this code should be but as it is at the moment you are opening a div inside the title attribute of the links. This is what is causing the problem. This code most probably has to be something like this:
Search your file for the words related posts. Just underneath this you should find the code that actually places your related posts. It is in this part that you will find this code for each entry.
It could be that you are using a plugin for related posts. If this is the case somehow the code in the plugin itself has been corrupted. In this is the case I would recommend a fresh download of the plugin.