dictionary generating with rules

[PMTU]

Hello there,

I'm playing with rules and dictionaries.
Hashcat v6.2.6

The source file (filename 11):
zong
zang
(no empty line)

Rules (filename 12):
f
f $!
^! f

for the first word it should generate:
zonggnoz
zonggnoz!
!zonggnoz!

And if I do echo -n "zong" | hashcat.bin -a 0 -r 12 --stdout it generates the expected output.
But ... with hashcat.bin -a 0 11 -r 12 --stdout it generates this:
zonggnoz
zonggnoz!
!zonggno~a
zanggnaz
zanggnaz!
!zanggnaz!

tried with a few different word but I was unable to find the cause.
Can someone tell what do I wrong?

Thanks