How to boot to new, cloned SSD and not old, source HDD

I recently got a new SSD and I cloned my old HDD to my new SSD.
I was able to boot into Ubuntu 16.04 LTS after the cloning process,but when I put the old HDD back into the computer, the computer boots using the old HDD, and not the new SSD as it should.
I used boot repair and selected my SSD as my "OS to boot by default" and it fixed grub. Now, when I select the SSD in the updated grub menu, it boots from the HDD instead.
How do I fix this?
Notes:
I think it may have something to do with the UUID.
My old HDD is found at /dev/sda2.
I currently have Windows 7 installed, and booting properly from the new SSD using the grub menu and experience no issues with Windows.

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