diff --git a/fixtures/simple_iterative_engineering_1.vcf b/fixtures/simple_iterative_engineering_1.vcf
index 3266d5a..f0bac46 100644
--- a/fixtures/simple_iterative_engineering_1.vcf
+++ b/fixtures/simple_iterative_engineering_1.vcf
@@ -5,5 +5,5 @@
 ##phasing=none
 ##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
 #CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO	FORMAT	f1
-m123	3	.	CGA	CA	1611.92	.		GT	1
+m123	3	.	CGA	C	1611.92	.		GT	1
 m123	16	.	GAT	G	1611.92	.		GT	1
diff --git a/fixtures/simple_iterative_engineering_2.vcf b/fixtures/simple_iterative_engineering_2.vcf
index 3c47c9c..b6a5d8e 100644
--- a/fixtures/simple_iterative_engineering_2.vcf
+++ b/fixtures/simple_iterative_engineering_2.vcf
@@ -5,6 +5,6 @@
 ##phasing=none
 ##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
 #CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO	FORMAT	f2
-m123	6	.	T	C	1611.92	.		GT	1
-m123	18	.	GG	GAATCAG	1611.92	.		GT	1
-m123	28	.	GA	G	1611.92	.		GT	1
+m123	5	.	T	C	1611.92	.		GT	1
+m123	17	.	GG	GAATCAG	1611.92	.		GT	1
+m123	27	.	GA	G	1611.92	.		GT	1
diff --git a/fixtures/simple_iterative_engineering_3.vcf b/fixtures/simple_iterative_engineering_3.vcf
index 2e39897..f356e0c 100644
--- a/fixtures/simple_iterative_engineering_3.vcf
+++ b/fixtures/simple_iterative_engineering_3.vcf
@@ -5,5 +5,5 @@
 ##phasing=none
 ##FORMAT=<ID=GT,Number=1,Type=String,Description="Genotype">
 #CHROM	POS	ID	REF	ALT	QUAL	FILTER	INFO	FORMAT	f3
-m123	5	.	A	G	1611.92	.		GT	1
-m123	16	.	CGGAA	CA	1611.92	.		GT	1
+m123	4	.	A	G	1611.92	.		GT	1
+m123	15	.	CGGAA	CA	1611.92	.		GT	1