Adding Ritard Messed Up Playback

I'm brand new to Notion, and have started working with it by engraving a relatively straightforward choral piece I've written (SATB plus piano).
I attempted to add a ritard. Now when I play back the piece, at the point where the ritard is, playback increases to very very fast. I've since deleted the ritard, but the playback is still messed up. I've tried displaying the NTempo staff, but there's nothing there.
Basically its like I have some sort of hidden instruction that's telling Notion to play incredibly fast at this point. I've tried adding a new tempo marking (q=70) at this spot to no avail.
Can someone tell me what I've done wrong and how to fix it?
Gracias!
I attempted to add a ritard. Now when I play back the piece, at the point where the ritard is, playback increases to very very fast. I've since deleted the ritard, but the playback is still messed up. I've tried displaying the NTempo staff, but there's nothing there.
Basically its like I have some sort of hidden instruction that's telling Notion to play incredibly fast at this point. I've tried adding a new tempo marking (q=70) at this spot to no avail.
Can someone tell me what I've done wrong and how to fix it?
Gracias!