Hybrid drives are an interesting beast, especially when the hybrid is done via the motherboard. Usually if you want Windows to handle the hybrid solid state storage properly, you have to format it a special way, give it specific flags, and sometimes even label it a specific way, all before installing the driver that handles the hybrid feature. And what you need to do for each of those steps varies by manufacturer.
Now of course FOG will see the drives completely differently since it is running a Linux kernel in the PXE boot. There could be some issues with how FOG is seeing the drives, especially since hybrid drives on laptops typically use unique storage controllers. I would suggest trying the “All Disks, non resizeable” option. Is this image you are making meant to go onto a different system? If so, I would strongly suggest building the image on a more generic build, such as a virtual machine or regular desktop.
Lastly, Ubuntu changed a lot of things in 14.04 and beyond, and those changes are unlike any other Linux distro. As such, there are some things that are still buggy in FOG and Ubuntu 14.04. I would strongly suggest going with a different Linux distro such as Debian, RedHat, or Fedora. If you must stay on your current setup, then I suggest backing things up, then upgrading FOG to the SVN branch (see wiki for How To). There are a lot of improvements in the SVN branch that are being prepared for the next major release of FOG. You may still need to work around an issue or two running FOG on Ubuntu 14.04, but your overall experience should be better.
If upgrading or switching Distros are not options, then we’ll need you to try a few of the troubleshooting steps that Tom listed. There are workarounds for the bugs in Ubuntu 14.04, but we will need a bit more information from you to help point you towards the right fixes.