Hi Cynthia,
Thank you for sharing your issue with your mouse moving the wrong way across your monitors. I am here to help.
It sounds like Windows thinks your monitors are in a different order than they really are. Like, it thinks the right one is on the left, and that's why your mouse is acting weird.
Here's how to fix it
Right-click on your desktop and click Display settings.
You'll see your monitors laid out there with numbers on them.
Just drag those monitor icons around to match how your screens are actually set up. If the left one is showing up on the right,drag it to the left.
Click Apply.
That should sort things out. Has this helped?
I hope this answer is helpful, if you have any questions, feel free to reply.
Best Regards,
Noel