Note: Marriage ceremony was performed by her father, Rev John Mumau
The certificate states that she is from Chewalah, Stevens Co., WA
and he is from Opportunity, Spokane County, WA

This is a Whitman County certificate that has Spokane County written over Whitman and it was file in Spokane County, It says they were married in Tekoa.
The marriage certificate issued by her father is from Spokane and states they were married in Tekoa. Apparently they filed the marriage both in Whitman County and Spokane County.