Ah Ha !
I've caught you out !

Regarding the below, stack is taken from actual location at a CALL or
LCALL.
stack is wider than PCL, includes  non R/W  PCH bits.  When you set
program page select bits, these do not take effect until the actual jump
or call at which time a special internal operation transfers them to the
the otherwise non R/W PCH register.

Easy english: LCALL does not spoil return address on stack.


Andrew Warren wrote:
> By the way, don't bother using the "LCALL" pseudo-op... Since it
> doesn't restore the code-page bits after the CALL, it's sorta
> useless.

        , Leave it to the PIC to save and restore stack correctly !