Round down stopped working

the dax below was working fine yesterday, today it is not anymore, don't know what happened

Md. Real Resolucao =
VAR Duration =
AVERAGE (Tickets2016[Tempo Real Resolucao - Segundos])
VAR Hours =
ROUNDDOWN ( Duration / 3600, 0 )
VAR Minutes =
ROUNDDOWN ( ( Duration - ( Hours * 3600 ) ) / 60, 0 )
VAR Seconds =
MOD ( Duration - ( Hours * 3600 ), 60 )
VAR H =
IF ( LEN ( Hours ) = 1,
CONCATENATE ( "0", Hours ),
CONCATENATE ( "", Hours )
)
VAR M =
IF (
LEN ( Minutes ) = 1,
CONCATENATE ( "0", Minutes ),
CONCATENATE ( "", Minutes )
)
VAR S =
INT(IF (
LEN ( Seconds ) = 1,
CONCATENATE ( "0", Seconds ),
CONCATENATE ( "", Seconds )
))
RETURN
CONCATENATE (
H,
CONCATENATE ( ":", CONCATENATE ( M, CONCATENATE ( ":", S ) ) )
)