DB_Intersect test results are inconsistent with the expected results

[yy101]

I compare the content of Table a and Table b. Their intersection should be the first four lines. However, the programme directly returns the contents of Table a.

./out/build/linux/frontend/frontend -intersect -nn 3
keyBitCount = 80
Table a: (a.mColumns[0].mData(i, j))
0,0: 1
0,1: 1
1,0: 2
1,1: 2
2,0: 3
2,1: 3
3,0: 4
3,1: 4
4,0: 5
4,1: 5
5,0: 6
5,1: 6
6,0: 7
6,1: 7
7,0: 8
7,1: 8
Table b: (b.mColumns[0].mData(i, j))
0,0: 1
0,1: 1
1,0: 2
1,1: 2
2,0: 3
2,1: 3
3,0: 4
3,1: 4
4,0: 13
4,1: 13
5,0: 14
5,1: 14
6,0: 15
6,1: 15
7,0: 16
7,1: 16
leftTable rows: 8
rightTable rows: 8
cuckoo table bins: 94
leftTable rows: 8
rightTable rows: 8
cuckoo table bins: 94
leftTable rows: 8
rightTable rows: 8
cuckoo table bins: 94
C rows: 8
Table c (Intersection result): 
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
n = 8   19370
Label                       Time (ms)  diff (ms)
__________________________________
inputs                            2.1      2.091  ***
intersect_start                   2.1      0.012  
intersect_preamble                2.1      0.007  
intersect_compute_keys           18.4     16.305  **********
intersect_cuckoo_hash            18.5      0.077  
intersect_select_cuckoo          20.6      2.155  ***
intersect_compare                22.3      1.638  **
intersect                        22.3      0.005  
reveal                           22.4      0.150