There are several fixes to this. just depends on how much work you want to put into it. This is usually caused by people using machine translation or manually translating without understanding the character limits of RPGM. You can fix this by editing the game to shrink the font, if you are using RPGM VX Ace there are scripts that can add automatic word wrapping to fix this on the fly / if the game is RPGM MV there are plugins that can be added and activated to do this.
Some searching online can locate the plugin or script of your choice and usually instructions on how to set it up, or maybe someone will be kind enough to fix it for you if you ask them.