Repeat Load vs Combination load- Both gives different result when used with seismic load. Which should be used for concrete member design?

I understand the difference between Combinational Load and Repeat Load. 

here is the result of Beam of a small sample that i have attached.

Check Load case 4 and 5.

Huge difference in MZ for Combinational Load and Repeat Load. Which one should be used for member design?

STAAD SPACE
START JOB INFORMATION
ENGINEER DATE 15-Feb-23
END JOB INFORMATION
INPUT WIDTH 79
UNIT METER KN
JOINT COORDINATES
1 0 0 0; 2 4.00001 0 0; 3 8.00002 0 0; 4 12 0 0; 5 0 0 4.00001;
6 4.00001 0 4.00001; 7 8.00002 0 4.00001; 8 12 0 4.00001; 9 0 0 8.00002;
10 4.00001 0 8.00002; 11 8.00002 0 8.00002; 12 12 0 8.00002; 13 0 0 12;
14 4.00001 0 12; 15 8.00002 0 12; 16 12 0 12; 17 0 4.00001 0;
18 4.00001 4.00001 0; 19 8.00002 4.00001 0; 20 12 4.00001 0;
21 0 4.00001 4.00001; 22 4.00001 4.00001 4.00001; 23 8.00002 4.00001 4.00001;
24 12 4.00001 4.00001; 25 0 4.00001 8.00002; 26 4.00001 4.00001 8.00002;
27 8.00002 4.00001 8.00002; 28 12 4.00001 8.00002; 29 0 4.00001 12;
30 4.00001 4.00001 12; 31 8.00002 4.00001 12; 32 12 4.00001 12; 33 0 8.00002 0;
34 4.00001 8.00002 0; 35 8.00002 8.00002 0; 36 12 8.00002 0;
37 0 8.00002 4.00001; 38 4.00001 8.00002 4.00001; 39 8.00002 8.00002 4.00001;
40 12 8.00002 4.00001; 41 0 8.00002 8.00002; 42 4.00001 8.00002 8.00002;
43 8.00002 8.00002 8.00002; 44 12 8.00002 8.00002; 45 0 8.00002 12;
46 4.00001 8.00002 12; 47 8.00002 8.00002 12; 48 12 8.00002 12; 49 0 12 0;
50 4.00001 12 0; 51 8.00002 12 0; 52 12 12 0; 53 0 12 4.00001;
54 4.00001 12 4.00001; 55 8.00002 12 4.00001; 56 12 12 4.00001;
57 0 12 8.00002; 58 4.00001 12 8.00002; 59 8.00002 12 8.00002;
60 12 12 8.00002; 61 0 12 12; 62 4.00001 12 12; 63 8.00002 12 12; 64 12 12 12;
65 0 16 0; 66 4.00001 16 0; 67 8.00002 16 0; 68 12 16 0; 69 0 16 4.00001;
70 4.00001 16 4.00001; 71 8.00002 16 4.00001; 72 12 16 4.00001;
73 0 16 8.00002; 74 4.00001 16 8.00002; 75 8.00002 16 8.00002;
76 12 16 8.00002; 77 0 16 12; 78 4.00001 16 12; 79 8.00002 16 12; 80 12 16 12;
MEMBER INCIDENCES
25 17 18; 26 18 19; 27 19 20; 28 21 22; 29 22 23; 30 23 24; 31 25 26; 32 26 27;
33 27 28; 34 29 30; 35 30 31; 36 31 32; 37 17 21; 38 18 22; 39 19 23; 40 20 24;
41 21 25; 42 22 26; 43 23 27; 44 24 28; 45 25 29; 46 26 30; 47 27 31; 48 28 32;
49 33 34; 50 34 35; 51 35 36; 52 37 38; 53 38 39; 54 39 40; 55 41 42; 56 42 43;
57 43 44; 58 45 46; 59 46 47; 60 47 48; 61 33 37; 62 34 38; 63 35 39; 64 36 40;
65 37 41; 66 38 42; 67 39 43; 68 40 44; 69 41 45; 70 42 46; 71 43 47; 72 44 48;
73 49 50; 74 50 51; 75 51 52; 76 53 54; 77 54 55; 78 55 56; 79 57 58; 80 58 59;
81 59 60; 82 61 62; 83 62 63; 84 63 64; 85 49 53; 86 50 54; 87 51 55; 88 52 56;
89 53 57; 90 54 58; 91 55 59; 92 56 60; 93 57 61; 94 58 62; 95 59 63; 96 60 64;
97 65 66; 98 66 67; 99 67 68; 100 69 70; 101 70 71; 102 71 72; 103 73 74;
104 74 75; 105 75 76; 106 77 78; 107 78 79; 108 79 80; 109 65 69; 110 66 70;
111 67 71; 112 68 72; 113 69 73; 114 70 74; 115 71 75; 116 72 76; 117 73 77;
118 74 78; 119 75 79; 120 76 80; 121 1 17; 122 2 18; 123 3 19; 124 4 20;
125 5 21; 126 6 22; 127 7 23; 128 8 24; 129 9 25; 130 10 26; 131 11 27;
132 12 28; 133 13 29; 134 14 30; 135 15 31; 136 16 32; 137 17 33; 138 18 34;
139 19 35; 140 20 36; 141 21 37; 142 22 38; 143 23 39; 144 24 40; 145 25 41;
146 26 42; 147 27 43; 148 28 44; 149 29 45; 150 30 46; 151 31 47; 152 32 48;
153 33 49; 154 34 50; 155 35 51; 156 36 52; 157 37 53; 158 38 54; 159 39 55;
160 40 56; 161 41 57; 162 42 58; 163 43 59; 164 44 60; 165 45 61; 166 46 62;
167 47 63; 168 48 64; 169 49 65; 170 50 66; 171 51 67; 172 52 68; 173 53 69;
174 54 70; 175 55 71; 176 56 72; 177 57 73; 178 58 74; 179 59 75; 180 60 76;
181 61 77; 182 62 78; 183 63 79; 184 64 80;
DEFINE MATERIAL START
ISOTROPIC CONCRETE
E 2.17184e+07
POISSON 0.17
DENSITY 25
ALPHA 5.5e-06
DAMP 0.05
G 9.28137e+06
TYPE CONCRETE
STRENGTH FCU 27578.9
END DEFINE MATERIAL
MEMBER PROPERTY
25 TO 184 PRIS YD 0.6 ZD 0.6
CONSTANTS
MATERIAL CONCRETE ALL
SUPPORTS
1 TO 16 FIXED
DEFINE IS1893 2016 LOAD
ZONE 0.24 RF 2.5 I 1.5 SS 1 ST 1 DM 0.05
SELFWEIGHT 1 
DEFINE WIND LOAD
TYPE 1 WIND 1
<! STAAD PRO GENERATED DATA DO NOT MODIFY !!!
IS875-2015:PARAMS 0 0 1 16.000 0.000 5.000 0 AGRA 47.000 0 1.000 0 5 1.050 -
1.050 1.050 1.090 1.096 1.000 2 1.000 0.002 0 0 5 0.000 0.000 0.000 0.000 -
0.000 0 1.000 1.000 1.000
!> END GENERATED DATA BLOCK
INT 2.776 2.776 2.776 2.992 3.025 HEIG  0  5  10  15  16
EXP 1 JOINT 1 TO 80
LOAD 1 LOADTYPE Seismic-H  TITLE EQX
1893 LOAD X 1
LOAD 2 LOADTYPE Seismic-H  TITLE EQZ
1893 LOAD Z 1
LOAD 3 LOADTYPE Dead  TITLE DL
SELFWEIGHT Y -1 
LOAD 5 LOADTYPE None  TITLE 1.5 DL +EQX REPEAT LOAD
REPEAT LOAD
3 1.5 1 1.0 
LOAD COMB 4 1.5 DL + EQX (Combo)
3 1.5 1 1.0 
PDELTA 10 ANALYSIS
PERFORM ANALYSIS PRINT ALL
FINISH