EnVar plug-in - Deleted Env variables

[romanBr]

We are adding PATH variables with EnVar plugin:

Section -Post

EnVar::SetHKCU
EnVar::AddValue "PATH" "$INSTDIR\Test"
EnVar::AddValue "PATH" "$INSTDIR\Test\SubFolder"

SectionEnd

On some computers this new variable is written, but all other variables in PATH are deleted, only some strange entry stays in ( "^W" or something like this ).

Any idea why this is happening?
Thanks.