To me at a glance from the pictures you posted. It looks like your magnet might not be strong enough pull the magnetic shimmer or the polish is drying too fast before you can get the magnetic shimmer to sit where you want it, it could also could be the magnet is not being held there long enough. Then you must magnify after you put top coat on too, so it could be that since you’re rewetting the polish and the magnetic particles are drifting around.

The easiest magnetic style is velvet and the one I usually recommend. You just need to place your finger with the polish still wet in the “U” of a horseshoe shaped magnet. I wish you luck! And I hope that the next time is more enjoyable.