Have you already played those files in wacup? As podcasts will attempt to have such a resume feature attempted (if they'd not been played all the way through) which can be configured via preferences -> media library -> history -> playback resume section. As well if it's happening between instances then that'll potentially be the autoplay handling (preferences -> general -> autoplay) but that only happens during initial start-up & not subsequent plays within the running wacup instance. Might also be useful to know what the file type(s) involved are in case it's something specific to that format &/or the input plug-in which is responsible for handling the (e.g. like some of the vgm related formats).
