weird keybinding conflict

[seth0xd]

I'm running Void Linux and SXHKD 0.6.2

super + baraketright
  mpc next && pkill -RTMIN+3 dwmblocks

this binding works fine however for no clear reason pressing super + shift + r runs the same command, super + shift + r stops working when I remove those two lines from my config and reload SXHKD. super + shift + r is not mentioned anywhere in the config file in fact I'm using that binding in DWM to decrease gaps.