Twitter getting multiple updates

I had "Send training updates via Twitter?" enabled. I noticed new behaviour today and I don't think I like it...

Old: Enter workout info, press Save or Blog (etc.), and tweet gets sent. Update workout info, no new tweet. So I'd often enter a brief summary of the workout for my (2) followers, then add mundane details (power or workout set or boring details about my blisters) that wouldn't all fit in the tweet.

Today: Enter workout info, press Save or Blog (etc.), and tweet gets sent for all currently available workouts for that day. Modify workout, and another tweet gets sent for all currently available workouts. For example: swam this a.m. Entered comment, save - tweet about the swim (expected). Then added the workout details - another tweet. Bike this evening. Entered comment, save - tweet about swim (again!), and bike. Added bike power info, and Back (forgot if I entered yesterday's stuff) - tweet about swim (#3) and bike (#2). Yesterday's workout is okay, so Forward - tweet about run. Added last info about bike and Blog - tweet about swim (#4) and bike (#3).

Is there a way to not re-tweet a workout that's been tweeted?

Thanks.