A technician is laser aligning a motor-generator set. The first set of readings calls for 0.025 inch under all four feet. The next set of readings calls for 0.050-inch shims to be added to all four feet, and another reading is taken. The laser calculation now calls for 0.100 inch under all four feet. The additional shims are added, and a new set of readings is taken. Now the laser calculation calls for 0.200 inch under all four feet. What is the problem?