If you quickly switch ur weapon or in the middle of switching and u picked up a flamegod, u get flamegod mode with the flamethrower on ur back and ur other weapon in ur hand. You can't switch weapons till flamethrower mode is done...
Yup, I noticed this one too. On this topic, I'd like to see the Flamethrower to be a dropeable weapon , so it doesn't disappear after you dessimate someone wielding the Flamer.
There is another bug - when you get flamer press and hold the fire button until flamegod mode runs out, you will be left with the flamer until you decide to drop it. You can also get different bonuses with the flamer: