Language String Problem

A very small Language String Problem. In the Language file under widgets “25”,

the variable %a

“25” => “joined %a ago.”,

not show. It is only joined ago. Should not be, since when the user is a member yet?

Unfortunately, the variable has no value. Does anyone know a solution?
Applies the latest version of the Auction Responsive Theme 6.6.5

Many Thanks for the help

Rene