Hello @Patrick_Babala and wellcome to the community, you’re in the right place to ask.
There are many topics on that subject. You can make a search on “calibration” and you’ll find many situations and the usual ways to fix it and understand the process.
Here a few, but, do it, surf that search because all you need to know is there:
hello @pattyyeonn welcome to the community. you are so close! there is a bit of learning and practicing to get the cut on the outline without showing the white. @redhada has suggested some great tips. I have some to share as well,
1/ check your firmware version
2/ calibrate, you may need more than 1 time
3/ make the image you want to cut a tiny bit bigger and cut just inside of it. so where you have “0mm” make it “-0” or “-1” using the offset tool in ideaStudio software. I can create a short video if you don’t find the help from what @redhada has suggested
let me know if you have done the first 2 steps, before you move on