diff --git a/src/main/java/cz/mendelu/dnaAnalyser/exporter/ExporterService.java b/src/main/java/cz/mendelu/dnaAnalyser/exporter/ExporterService.java
index 08bb9b0311a4b1d40a9d096a3c2c96ba2d2327cd..686bc4566239a4ac1dfc7f7acd1abb1fbb064feb 100644
--- a/src/main/java/cz/mendelu/dnaAnalyser/exporter/ExporterService.java
+++ b/src/main/java/cz/mendelu/dnaAnalyser/exporter/ExporterService.java
@@ -265,8 +265,8 @@ public class ExporterService {
 
                 resultBuilder.append(String.format(format,
                     chrom,
-                    posInGenomeStart + chromStart,
-                    posInGenomeStart + chromEnd,
+                        (posInGenomeStart - 1) + chromStart,
+                        (posInGenomeStart - 1) + chromEnd,
                     dataValue
                 )); // This is now using StringBuilder