If you have a Diamond Sword equipped, there's a fishing rod in your hands as well.

EDIT: This doesn't always happen. Seems to be somewhat random

Steps to reproduce:

1) Equip a Diamond Sword
2) Use your rod ability

Observed result:
The rod will sometimes be stuck in the players hand alongside the sword, glitching both textures out

Expected result:
The rod should not stay in the players hand