What is wrong with Flow 3 Bar 20. A green rest is missing and it does not play back right. But if I delete those last two green notes (G,D) and try to re-enter them nothing aligns correctly.
In addition to @benwiggy 's observation, there are numerous instances where the quavers are in the correct place, but you have hidden the quaver rest (the previous quaver has the ends voice property set).