Arduino Pro Micro TX RED Diode always on

[ihora]

Dear sir,

Thank you for your amazing work. I just assembled your gameport-adapter on breadboard and it works excellent!
The only thing I am worried about a bit is that the TX right diode on the bottom part of the Arduino Pro Micro board is shining red anytime the joystick is activated.
Normally I would assume that this is totally correct as the board just started transmitting data, but at the beginning of testing the adapter, I did not have this diode shining red so I hope I did not short circuited my board and this RED diode lightning does not mean that the adapter is transmitting data rather it detected fault.
If TX diode shining red is not a normal state, could you please possible explain me what the issue could be?

Best regards,
Ivo