Hello drts19,
We'd be happy to take a look at your mouse with you. To get started, if you could provide the model of the Mac that we're working with, we can provide product specific steps for you: Find your Mac model name and serial number - Apple Support
If you can't connect your Magic Keyboard, Magic Mouse, or Magic Trackpad to your Mac - Apple Support can help resolve this if you're using a bluetooth mouse with your Mac, as well as: If your keyboard or mouse won’t connect during Mac setup - Apple Support
If those steps don't help resolve this, let us know the following:
Does this occur when using a particular app or on a certain website?
If you're using a portable Mac, are you using the built-in trackpad?
When this occurs, do other features of the mouse work? For example, you're able to scroll but unable to click or double-click to select anything.
This ensures we provide accurate steps for your particular issue, and can help target our troubleshooting.
Take care!