Particles collide properly in preview but not render

Hi:

I’m trying to have some particles his a collision object and then slide off.

What’s confusing is that the previews and even the f12 renders work and then when I go to render the animation, the particles don’t collide. They just pass through the collision object.

what the hell am I doing wrong? I’m fairly new to Blender and the forum so I can’t attach a file of the project so…

Here’s a link to the project file.

I’m on Blender 2.82a or 2.81
I’m also on a MacPro 2019 with tons of Ram so I don’t have an Nvidia Card so I’m not sure if that has anything to do with it.

Help! Thank you! Help! Thank you!

best,

Fred