Negative values on scales from a La Marzocco Linea Pb

Hello! Our café recently got a brand new La Marzocco Linea Pb 3 group machine. Pretty early on into its use, the scale underneath the third group started to read negative values while in use. We programmed it to mass mode, so the third group never reaches its target weight. Has anyone else encountered this issue? Scale has already been recalibrated, and I’ve ensured its dry too.