How to make fixed particle system scale?

Hey! I am new to the forum so if I'm doing something wrong, let me know. I have a spritesheet material placed in a particle system, and everything works up until I move away from it. It then scales to different sizes depending on how close or far I am from it. I'd like the particle system to have a fixed scale. I've attached a short video demonstrating the problem. Does anyone know how to solve this?

https://www.youtube.com/watch?v=cNzbkjmF-VU