(help)Weapon's position

[Berany]

Hi.
I made a character and a custom weapon.
Both characters and weapon work normally, but there is a problem.
When the character is equipped with a weapon, the location of the weapon is strange.
Based on when my character is facing forward, when the character is equipped with a weapon, it is located at the bottom right.

As an example,
When the character is equipped with a weapon, its position is shown in the red spot in the picture.
I'd really appreciate it if you could help me.
Thank you.