You may be hearing the Secondary Audio Program (SAP) available on most TVs with stereophonic sound systems. You can turn this off with the selector labeled SAP, MTS, Audio 2, or Audio B on your TV panel, remote-control device, or on-screen menu. Un-selecting the SAP channel should eliminate the secondary or Spanish audio you’re hearing.
If you're not able to un-select the SAP channel, review your TV manual or contact a TV vendor who can guide you through the process.