Yes, that is not how it should be. Can you test the card on another computer to verify that it works properly there?
Then if it does, try clearing your CMOS on this board and see if that helps. If it doesn't then try putting the card into the x8 slot and boot into widnows and let the drive update, then shut down and put it back into the x16 slot and boot back into windows and see if it's corrected.
Also, please update to the latest BIOS if you are not using it already, as that may solve the issue itself just via the update clearing the DMI Pool. Use Qflash or DOS and if using Qflash be sure to disable keep DMI data. Then once the flash is done boot into the BIOS and load optimized defaults, then save/apply/reboot BACK to the BIOS. Once in the BIOS again set all your necessary settings, such as memory voltage, and SATA settings, then save/apply/reboot to windows and check the PCIE link again.