These are files that LW has detected some problem with. Normally it will ask you what you want to do ... continue the downld/rety or abort the downld. But it looks like you originally chose No, & clicked the 'always use this answer' option box. If you want to undo the option for future then go to Tools>Options>View>Popups & tick the Revert to Default & press Apply. So then next time you can have the option to choose whether to continue the downld or not.

Perhaps you should read this: T3 Spammers; mp3 Bit-Rates Versus File Sizes