It's normal for fonts to be merged into one in certain circumstances, such as if they are bold/italic variants. What are the full, exact names? What version of Acrobat and which editing function?
I ordered an had installed the following:
There is one singular font name in list. Helvetica NeueLT Std Med
I am using Adobe Acrobat Pro XI Pro. I am using the function in tools called edit text & images.