Not All Scrobbled Songs Are Submitting

For the past week now, every time I sync my iPod it will say I have certain number of songs to scrobble but every time I submit, it says they were scrobbled but only a fraction of them show up. For instance, today it said I had 72 songs listened to but when I submitted it, only 25 actually showed up on my profile. I checked the last.fm software for possibly any cached songs but there was nothing. It says that all 72 were submitted. Is anyone else having this issue or is there possibly something wrong with my computer/settings?