For some reason, your CT scanner assigned different acquisition numbers to groups of slices. You may be able to adjust the settings on your scanner to avoid this. Alternatively, you can force loading the entire series as one volume by clicking the “Advanced” checkbox in the DICOM browser, clicking “Examine”, then in the loadable list select the item that is not split by acquisitionNumber.
Please also try the current Slicer version. A lot of improvements/fixes have been implemented since Slicer-4.11, including in the DICOM browser.