I have not seen another instance of this. I’m attempting to gather more specifics.
The Boss 3655 was available in different series using different controllers, The LS series use a Ruida Controller. The HP series uses an AWC / Trocen controller. I’d like to confirm which controller you have and which operating system LightBurn 1.2.00 is running in.
A screen capture of the whole LightBurn interface may inform us further.