Hello. I have 7” engineered hardwood throughout my home. Humidity is normal at 40%. I’ve noticed 3 random high spots between rows in the main room. You can’t see them but can feel it slightly. Is this buckling? There is no play when you step on the boards, doesn’t feel as if there is any open space below the slight rise. Very weird. Perhaps excess glue? Always been that way just never noticed ? Pls help

This seems to be just a high spot of the sub-floor. Have you used a straight-edge to compare this spot to see if there are similar areas. Sometimes a part of the sub-floor can be missing fasteners to create a hump. This is unusual.