As you can see in the previous message the problem does not appear when using english language.
This window uses the strings 22004 and 22005 from the language's strings.po
From spmc's git , i can see that these id's are used by xbmc/settings/dialogs/GUIDialogAudioDSPSettings.cpp
See : https://github.com/koying/SPMC/blob/...SPSettings.cpp
My regards.
EDIT: I fixed it by editing strings.po in Greek language

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