Blurry shatter in render issue

I'm making an intro and in the RAM preview everything displays perfectly. However, after I've rendered it my comp seems to be blurred during a shatter effect towards the end, as can be seen here:

However, it's completely smooth with no blur in the RAM preview:

Is there any reason for this?

If it helps I've used multiple media players, including VLC, Windows Media Player and Quicktime. I've checked all the blurriness settings and everything in my render settings and have rendered this at least 10 times with different settings each time but it's giving me the same result.