Volumio I2S flac mono problem

I have rPi with volumio 1.4 via I2S on DSP (Najda)
source is usb hdd
The thing is that i have stereo while playing mp3 and wav.
but when I play flac i get mono !!!
Only left chanel goes to bouth DSP chanels

any idea what to look/do ?

Which driver are you using?

Thanks…I have solve this…

I’m useing first on the list…sorry don’t remember the name…(that’s the only one that work with flac files…)
edit…I’m useing hifiberry i2s

But to have stereo, I had to turn the resemple to 32bit (44.1khz)…
without resemple I had only mono with flac files…