Floating floors can feel bouncy or spongy and can be creepy to walk on. The original contractor may be on the hook for replacing the floor, but check and see if your time for filing a workmanship warranty claim is still valid.

The repair attempt is not how to address a floating floor that tents.

HAL HERE. BY MY BOOK FOR 79 IT SAY'S TO:

PULL BACK THE CARPETING IN THE PROBLEM AREA AND MARK THE EFFECTED FLOOR SURFACE.
WITH A CIRCULAR SAW,REMOVE THE TOP LAYER OF PLYWOOD AT THE MARKED FLOOR SURFACE AREA
CUT OUT THE DAMAGED STYROFOAM CORE MATERIAL AS REQUIRED. NOTE: MAKE STRAIGHT LINE CUTS WITH 90* CORNERS IF POSSIBLE.
CUT NEW SECTION OF STYROFOAM AND PLYWOOD TO THE EXACT SIZE OF THE CUT-OUT AREA. GLUE INTO PLACE.
IT IS RECOMMENDED THAT A 1/2" BEAD OF SCHNEE-MOOREHEAD 5522 SEALING COMPOUND BE APPLIED ALONG THE PLYWOOD SEAM OF THE REPAIRED SURFACE.