Nikon native shutter speed not setting correctly

If I use any shutter speed <30s it always sets the shutter speed to index 17, which corresponds to 1/1.3
#!

[2018-04-21T11:04:09]      [DEBUG]      [MemberName] StartExposure
[2018-04-21T11:04:09]      [DEBUG]      [FileName] D:\Projects\nina\NINA\Model\MyCamera\NikonCamera.cs
[2018-04-21T11:04:09]      [DEBUG]      [Message] Prepare start of exposure: 10

[2018-04-21T11:04:09]      [DEBUG]      [MemberName] StartExposure
[2018-04-21T11:04:09]      [DEBUG]      [FileName] D:\Projects\nina\NINA\Model\MyCamera\NikonCamera.cs
[2018-04-21T11:04:09]      [DEBUG]      [Message] Exposuretime <= 30. Setting automatic shutter speed.

[2018-04-21T11:04:09]      [DEBUG]      [MemberName] SetCameraShutterSpeed
[2018-04-21T11:04:09]      [DEBUG]      [FileName] D:\Projects\nina\NINA\Model\MyCamera\NikonCamera.cs
[2018-04-21T11:04:09]      [DEBUG]      [Message] Setting shutter speed to index: 17

[2018-04-21T11:06:16]      [DEBUG]      [MemberName] StartExposure
[2018-04-21T11:06:16]      [DEBUG]      [FileName] D:\Projects\nina\NINA\Model\MyCamera\NikonCamera.cs
[2018-04-21T11:06:16]      [DEBUG]      [Message] Prepare start of exposure: 5

[2018-04-21T11:06:16]      [DEBUG]      [MemberName] StartExposure
[2018-04-21T11:06:16]      [DEBUG]      [FileName] D:\Projects\nina\NINA\Model\MyCamera\NikonCamera.cs
[2018-04-21T11:06:16]      [DEBUG]      [Message] Exposuretime <= 30. Setting automatic shutter speed.

[2018-04-21T11:06:16]      [DEBUG]      [MemberName] SetCameraShutterSpeed
[2018-04-21T11:06:16]      [DEBUG]      [FileName] D:\Projects\nina\NINA\Model\MyCamera\NikonCamera.cs
[2018-04-21T11:06:16]      [DEBUG]      [Message] Setting shutter speed to index: 17
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