Light Switch/outlet Combo, Load Issue

I replaced an existing light switch with a switch/outlet combo.  The outlet works and switch operates light only, all appears to be working.



I plugged in a 660W device into the outlet and the light starts to flicker when the device is on, when the device is off, light stops flickering.



If I move the 660W device to an existing outlet in the same room, light does not flicker.



I don't think it should be a load issue but couldn't figure out why else the light flickers.
      


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hello

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~S
      
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