I too would love to see open sprinkler integration with smartthings someday. I don’t know how to code it but would be willing to help contribute some $$$, time and access to my devices if someone is willing to give it a shot.
Thanks for your quick response and for doing what you do. Glad it is a known issue. Was going through the calculation manually and was pretty sure there was no way it should be turning my sprinklers on tonight.