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I have this same problem. I tried to re-enter all prices/counts as whole numbers but this did not resolve the issue.
I did try the other edit button shown, but the issue persists.
I have tried this on two different browsers (Chrome and Safari) on macOS.
seconded / thirded
Customer support service by UserEcho
ditto. Chrome Version 92.0.4515.131 (Official Build) (x86_64) on macOS