How can I have TWO separate Global Variables with the SAME Name?

[bobkrohn]

How can I have TWO separate Global Variables with the SAME Name?
I dunno, but I did it.

Looking in Shift Mem/User Variables I see TWO with the exact same Name.

"SF" which is used in my programs. It's a REAL type
It's Declared at the top of the Source Project File.

What's more I can change the value on one of them and it does not affect the other!

The other problem is how do you get rid of them?
(or ANY variable for that matter, there is no Delete button)
"purge(SF)" doesn't work. (says no such Variable)

Tried to Clone Calc to Emulator for a screen shot but the double instance of the variable didn't come over.
So took the attached pic with my iPhone.