Theremocouple Installation Question

Just replaced a thermocouple using a Honeywell standard Thermocouple for a Genesis boiler and everything seems to be working fine. My concern is that I see a flame both at the end of the thermocouple and the base of the thermocouple.

I own a three family and thus have three boilers one of which the thermocouple was replaced a few months ago by a plumber and the same exact same situation is happening on that boiler. Thus I assume it is ok or the plumber would not have left it that way.

On the boiler where the thermocouple has not been changed, I only see a flame at the end of the thermocouple.

Should I be concerned?

flame

Without seein it we cannot tell what is happening, but a flame at any location other than the tip of the thermocouple will burn it out, or cause it to malfunction. You may have gas leak at the pilot burner or a plugged pilot burner.