I don't think it will be hazardous. If the rivets are zinc-plated, I doubt it would add enough zinc to be a problem. But, as others have noted, you might have problems down the road from galvanic corrosion. Those rivets could eventually fail.
It might be that some wrong rivets found their way into the manufacturing process. It happens. You should contact Polarware. Send photos. I'd think that they would want to know about these mfg. issues. The kettles are probably contract manufactured offshore, and Polarware would need to know about non-conforming goods coming from there.
It might be that some wrong rivets found their way into the manufacturing process. It happens. You should contact Polarware. Send photos. I'd think that they would want to know about these mfg. issues. The kettles are probably contract manufactured offshore, and Polarware would need to know about non-conforming goods coming from there.