This is the result of a new way that the owners of this site made the software interpret and play swinging eighth notes. It was fine, but now it does not work. Look at this song I wrote:
https://flat.io/score/66d9e4a4810d7530a2e05d44-reverie It was working last night, but now it just sounds like it crapped itself. The bass line is not swinging either. Please report this bug so more attention is brought to it. Thank you.