RPN programming perplexity driving me nuts

[lemontea]

Hi folks,

Maybe it's my advancing years (lol) or something, but I just can't figure out what is going on.

Wrote a very simply RPN routine on my 15C and the "bug" seems to replicate on 11C so must be a logic issue.

I just want to calculate

X - 1
------
X^2 - 1

(x minus 1, divided by x-squared minus 1)

So this is what I put in:

LABEL A
ENTER
1
-
X <-> Y
X^2
1
-
/
R/S

The way I run it is just typing a number then issuing "f A" to run it.

It seems not to work as intended if I do not press ENTER before issuing "f A"

I thought the first ENTER (line 2) already puts the number I typed into both Y and X on the stack?

And that I do not need to press ENTER before running the program, because whatever I typed (prior to issuing f-A) is already in the X register?

???