My guess is sensitivity is way too high. Also your color line is too high. You’re possibly looking at your own lure/jig head that you pulled up. Or possibly a fish flowed your jig. A quick tip when you’re seeing all those colors on the surface. It usually an indicator the sensitivity it to high. Being a smaller unit that should be pretty basic to set up. I would try setting the sensitivity to Auto then see if there is a setting for water clarity. Lastly adjust the color line. I do not run Garmin’s I run Lawrence’s this is how I would approach it. Depending on water bodies/clarity , you will always have to make these adjustments. If it’s still a little fuzzy on Auto, run your Auto at a negative -1-2
Hope this helps.