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Flame in Burner Bed Tube

I have an older hydrotherm boiler in my house. Tonight I noticed a weird noise coming from the boiler in the basement. When I inspected the boiler, it appears that a flame was occurring inside one of the tubes of the burner bed. I turned the heating system off at the thermostat. Gave it a few minutes and turned it back on. When it fired up, the problem didn't reoccur. Is this something that randomly occurs or sign of a larger problem?