The program shows that they are already at 100% but this isn't the case. There are about half the size zoomed out. When I open te RAW files in an other program I can view them at the actual size so the RAW files aren't the problem.
This is because Daminion is not displaying the RAW image itself but a JPEG preview written by the camera and embedded in the RAW file. Some digital cameras only write half size JPEG previews, which is why some of your RAW previews may not be displayed at 100%.
Using embedded JPEG previews is the only way to ensure the same picture is displayed in Daminion and in your Camera RAW editing program. Note that different RAW editors may display the same RAW images differently.