Conditional formatting copying incorrectly.

MyEXCELRL 

I appreciate the fact that you say 

When copying a formatted cell to the row directly beneath, it appears to be corrupting the new and original conditional format. [emphasis added]

I use Conditional Formatting very carefully. I'm also on a Mac system (which may or may not be relevant; I suspect not)... my basic learning vis-a-vis conditional formatting in general is that it's tricky. I find when I'm expecting to create a rule, or a set of rules, that will apply to multiple rows or columns, it works best to select all of the anticipated rows or columns, rather than to set the rule(s) to one row and copy to more. It has to do with the relative and absolute references, and how they're managed during the copying.

That, and just in general, until you're really really comfortable with how Conditional Formatting works, expect it to be a matter of trial and error before you get it to work exactly as desired.

Here, for example, is a set of rules I've created that apply to one column based on values in different cells in the same sheet and even in a different sheet in the same workbook. In creating them, I selected that whole range under "Applies to" and then test each rule to make sure it's working before I go on to the next. Notice the different uses of absolute and relative ranges.