Yeah, there's been some weird glitches with weapons and other items sometimes turning into fishing poles. I'm not sure of the pattern or consequences of what makes it occur.
I think what was tried in these past reports to work around it and get the game to realize it's not a fishing pole was throwing the item onto the ground and then picking it up again, putting it into a chest and taking it out, and fully turning off Terraria and restarting it. Good luck.
If you can remember what happened right before the Flamethrower turned into a fishing pole, be sure to tell it in detail to 505 Games at their bug report form here: https://fs30.formsite.com/505games/form15/index.html
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