According to your post, it sounds like you were manually creating partitions. So it makes me wonder if you made them correctly. Here is how it is on my computer, and these were automatically made, by the Zorin installer BTW.
I assume you clicked on install Zorin OS after you made those partitions, and installed Zorin OS onto the hard drive. You may have done it wrong, in which case, here is a very helpful guide from our very own Harvey, the partitions expert.
