Why doesn't the program calculate Cs per equation 12.8-5 ? Cs used is calculated from Eq 12-8-3. If calculated per 12.8-5 the Cs=0.044xSds=0.046 (which is the minimum Cs value to be used) is greater than 0.034.
Check this post regarding ASCE 7-16, Cs(max) for ELF Seismic loads https://communities.bentley.com/products/ram-staad/f/ram-staad-forum/176553/cs-max-asce-7-16