In order to sync Tasks to Tasks and Issues to Issues you need to edit your Synchronization Mappings in your TeamPulse project. You could read more about that here
First you will have to edit the Entity Mappings. For the task, for example it should be something like that:
Then you will have to configure the Field Mappings, so the TeamPulse fields match the TFS fields.
If the information does not help you or you have any troubles configuring the mappings, you could write us back at any time.