Hey there @nmarshall635 !
Thanks for posting on the Instructure Community.
While there could be several reasons for your course cards appearing smaller than normal, based off of personal experience it is because your page size is zoomed in larger than 125-150%.
Another reason could be the device you are using, such as if you're using a phone or small tablet it may appear condensed, however it won't on a laptop/personal computer.
I recommend changing your Dashboard view from card view to something else, such as recent activity. Refresh your page, then re-select card view and see if that works. You could also clear any browser cache, as this can sometimes cause bugs and errors within the canvas interface.
This guide may also help you out: https://community.canvaslms.com/t5/Student-Guide/How-do-I-use-the-Dashboard-as-a-student/ta-p/512
I hope this helps, and while there could be more reasons, this is what I've done in the past when I've experienced this issue.
Reach out with any questions or concerns, thanks!
Noah B.