When (-)FY is inserted, it works without any problem. By the way, in the case of (+) FY load, is the FY value of DL reaction force and seismic load different?
At 10kN(+Fy), the seismic load is 215.46KN, and the reaction force of DL is 197.51, which is different... How can you prove this difference within the program? Can the program see why this difference is made?
if you attach the file, it may help to find out what happend