Hmm, this is very strange. Maybe the guitar is defective? I advise you to contact the manufacturer’s support service, they can certainly help you. Either there may be a problem with the amplifier, or with the wireless cable. Try plugging your guitar into another amp with a regular cable. Personally, I’ve never trusted wireless cables because I was afraid of something like this, so I prefer best guitar accessories. If the problem is in the equalization, you can simply fix everything with a plugin, for example FabFilter pro q3, or any other your favorite equalizer, in order to fix it, but in any case I would advise you to change the cable. It seems to me that the problem is in it.
