ZIGZAG AUTO mode side distance issue

I have Hexacopter configuration for spraying application. ZIGZAG Auto mode is enabled. After recording A and B point, after switching it to ZIGZAG Auto mode, first row side distance is taken double the distance assigned. For Ex: If side distance is 4 m , then first row distance taken by drone is 8 m after which it continues 4m side distance. Am i missing some parameters.