Let's start by understanding why this happens. If your game runs on a monitor with a refresh rate higher than 60 Hz, for example, 120 or 144 Hz, then the game will operate at that frame rate. Apparently, the developer did not ensure that the movement of objects in the game would be consistent across all frame rates. As a result, if the screen's refresh rate is 120 Hz, then bullets will move twice as fast.

As you might have understood, to fix this issue, we have two options: use a graphics card application like the Nvidia Control Panel to set the desired frame rate, or adjust the monitor's refresh rate.

I'll provide an example using the Nvidia Control Panel since I have an Nvidia graphics card:

1. Open the Nvidia Control Panel.
   
   
2. Navigate to "Manage 3D Settings."
   
   
3. Choose "Program Settings."
   
   
4. Select the game you want to adjust.
   
   
5. Set the "Max Frame Rate" to your desired value. For smooth gameplay, this would be 60.
   
   
6. Don't forget to click "Apply."
   

After doing this, launch the game, and you should notice that animations, such as bullet trajectories, will move at a consistent speed.