Postman add extra line in the header, when use a global variable

I try to run several request that uses AUTHORIZATION header.
When I defined AUTHORIZATION with some-authorization-key, everything is working fine.
When I defined global variable MY_AUTHORIZATION_KEY with value some-authorization-key and use this global variable for header definition, like {{MY_AUTHORIZATION_KEY}}, the post man put an extra empty line in the request header, which breaks the HTTP structure and does not work.

Are you sure the value of the variable does not have the additional line break?