Why are the nails hitting on the finished part of the wood, not on the tongue?

This happens because of some mistakes in the time of installation. I am sharing the common issues during installation and how to overcome this.

Inappropriate separating: To stay away from buckling, subfloor boards ought to be separated with a 1/8-inch gap at all edges and closures to give space to normally occurring extension. Tongue-and-depression edges on numerous superior floor boards, for example, Weyerhaeuser's Edge Gold® OSB boards, are intended to self-hole.

Utilizing green joists: Wet timber may prompt dimensional changes as the joists dry, resulting in nail pops and floor squeaks. Use Trus Joist® TJI® joists or oven dried, execution tried wood, for example, Weyerhaeuser Framer Series® lumber, which is more dimensionally stable than green timber.
Not letting a subfloor dry: Continuously store floor boards under cover. OSB uncovered amid development must be permitted to dry (particularly before introducing delicate complete materials, for example, hardwood flooring). Edge Gold incorporates protected Down Pore®grooves that assistance shed standing water and a restrictive edge seal to diminish edge swell.

Inappropriate nailing: To maintain a strategic distance from nail pops, pullouts, and shiners (nails that scarcely hit the joist), all of which can cause squeaks, utilize the right nail size and separating, and guarantee the nails enter the floor joists and sink completely.

Renouncing paste: A paste nailed development strategy is ideal for guaranteeing a level, stable floor. Utilize a dissolvable based paste that meets ASTM D3498 execution guidelines; in situations where latex subfloor stick is required, cautious determination is important because of the wide scope of execution between brands.

Inappropriate glue application: Apply glue per maker's determinations. Make certain the joists are dry and free of soil before applying. Numerous producers suggest applying a consistent ¼-inch-breadth stick dot to encircling individuals and utilizing a serpentine example for backings that are 3½ inches or more extensive. Apply two drops of paste to board joint areas; a 1/8-inch stick dab connected at the tongue-and-score joints can additionally enhance floor execution.

Let the glue be dry: If the glue remains wet, it will lose a portion of its quality or may not bond by any stretch of the imagination. Apply sufficiently just paste for a couple of boards at once, and totally attach each board before the paste is set. Check producer specs for setting times, and remember that warm climate can quicken those occasions.

Hammering edges: Utilizing a heavy hammer to constrain a tongue and section joint together firmly can pound the wood filaments, harming both the board hit and also the one it is constrained into. Further, it can shut everything down essential hole on board edges, prompting inappropriate dividing issues referenced previously. Some excellent boards, for example, Edge Gold, are intended to fit together effortlessly. In the event that extra power is required, dependably utilize a square of wood against the section edge to limit harm to the board, and dependably permit a 1/8-inch hole between boards.
Recheck your work: Hardwood floor refinishingis very important after the installation. After all walk on the floor to check if there is any squeaks, missing fasteners, improper nailing, etc.

If you follow above all steps in future after installation in future you not face such problem what you are facing now.

The only causes I can think of for this would be:
1) The tool not being placed properly on the wood
2) The wrong depth shim on the foot
3) A broken nose assembly

Is the bottom of the shoe on the sub floor?