Hot power adaptor?

Hi all. A quick question. How hot is the power adaptor supposed to get? I have a number of Pd power bricks with other devices, but the Pico adaptor gets much hotter than any of them.

Almost too hot to touch us a regular occurrence. Is this designed in or dhould I be concerned?

Please advise as the last thing I would want is to ignore a potential issue and end up with an emergency situation.

Kind regards,