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Just a bug. You can go to Menu > Tools > Cashu Tools > Bump counter to work around this, OR remove the mint and re-add it.
Bumping the counter allowed for the send to work.
However I ended up with 2 more sats then I originally had.
Steps:
  • Sent 10 Ecash Sats from Coinos to Zeus.
  • Sent 10 Ecash Sats from Zeus back to Coinos
I ended up with 10 Sats on Coinos and 2 Sats on Zeus. The "fee" was going to be 2 sats, I don't know if this had anything to do with it.
Hopefully my very limited testing is helpful.