RE: Varying Analysis result for beams

Yes the issue only happens when a load combination is created by factoring another load combination as is the case for the load combination 4. If you create a load combination by directly applying the factor of 1.5 to the primary load cases ( as in LOAD COMB 6 below ) or if you create a REPEAT LOAD using the primary load cases ( as in LOAD 5 below ), the results reported by the Member query match with the other results.

LOAD 5 LOADTYPE None TITLE LOAD CASE 5
REPEAT LOAD
1 1.5 2 1.5
LOAD COMB 3 SL
1 1.0 2 1.0
LOAD COMB 4 UL
3 1.5
LOAD COMB 6 COMBINATION LOAD CASE 6
1 1.5 2 1.5