Wow. I've never seen this contraption before. It appears to beak down the "scary" steps for the novice gardener while building up their experience planting each year. Pretty cool.
The instructions show the novice gardener transplanting new seedlings. They don't show a direct seed into the box. What I'm presuming is... you planted the seeds somewhere between 1/4-1/2" deep in the suggested potting mix.
Yes? If so, the seeds could move if the box was jostled or if the top paper disturbed the surface.
So, if you want to know "exactly" where your seeds are on planting, start off with some seeds in a Jiffy-7 set up. The seed goes right in the middle of the Jiffy-7 depression. Can't wander! Then transplant the seedlings into your Garden Box!
Jiffy-7®
Good luck!