I've got engineered wood flooring installed about 4 weeks ago and start noticing patches/areas with lacquer lifting form the wooden floor, mainly around the areas of wood imperfections (nots, cracks, etc.) and where the board connect to each other (see pictures). I've measured the room humidity and it was all within the norm. The floor is glued to the concrete with Underfloor heating set at 22 all the time. Any ideas if this the material defect or something to do with the installation, any thoughts? Thanks!