Ah, in that case. I wonder if it is not a conflict with the multimedia plugins filter.
If the PoodLL filter and Moodle’s Multimedia Plugins filter both filter the same text you get “double filtering” and that can mess up the links . This is usually fixed if you make sure the the PoodLL filter is higher in the list of filters (Site Administration->Plugins->Filters->Manage filters ).
But in a label or topic summary it might not be. Try turning off the multimedia plugins filter temporarily. Does that fix it? If so, you can tell the Multimedia filter not to handle MP3/FLV/MP4 etc at
Site administration->Appearance->Media embedding .
Alternatively you can tell PoodLL not to handle those files, on the PoodLL filter settings page. Or you could just leave the Multimedia Plugins filer disabled, and rely on PoodLL for all that stuff.