about the result of SURVIVOR

[xiaohuli-45]

I am trying to merge some vcf, The command line is: SURVIVOR merge sample_files 1000 2 1 1 0 30 merged_vcf.
I think the first '1' indicates that the SV types identified by the two callers are the same, but there are the following results in merged vcf: one caller identified INS and the other identified DEL. I don't know why. Can you help me?

chr8 144125781 Sniffles2.INS.1A75S7 N GAGCACGGGGCAGAAGGAGTTTCAGTGGGCCATGTGGATGCTCTCAGAGCCAGGGTGCTTGGCCATGGGTCACCTCCTGACAGATGGAAAGCTCGCAGCCACTGTCTGCAGCCAAGTTGCTGGTGGTGCTGCCCAA 60 PASS SUPP=2;SUPP_VEC=11;SVLEN=-386;SVTYPE=INS;SVMETHOD=SURVIVOR1.0.7;CHR2=chr8;END=144125781;CIPOS=-177,9;CIEND=-42,150;STRANDS=+- GT:PSV:LN:DR:ST:QV:TY:ID:RAL:AAL:CO 0/0:NA:61:43,3:+-:60:DEL:Sniffles2.DEL.132B4S7:ACCGGACGGCCCGCGGCGGGGAATATTCTACCGGACGGCCCTCGGTGGAGGAATATTCTCC:N:chr8_144125779-chr8_144125840 0/1:NA:386:52,28:+-:60,45,60,60,57,60,60,60,55,60,58:INS,INS,INS,DEL,INS,INS,INS,INS,INS,INS,INS:Sniffles2.INS.1A75S7:N:GAGCACGGGGCAGAAGGAGTTTCAGTGGGCCATGTGGATGCTCTCAGAGCCAGGGTGCTTGGCCATGGGTCACCTCCTGACAGATGGAAAGCTCGCAGCCACTGTCTGCAGCCAAGTTGCTGGTGGTGCTGCCCAA:chr8_144125781-chr8_144125781,chr8_144125604-chr8_144125604,chr8_144125764-chr8_144125764,chr8_144125790-chr8_144125848,chr8_144125738-chr8_144125738,chr8_144125778-chr8_144125778,chr8_144125765-chr8_144125765,chr8_144125747-chr8_144125747,chr8_144125738-chr8_144125738,chr8_144125762-chr8_144125762,chr8_144125746-chr8_144125746