The problem is that they didn't allow for the extra centimetre of overlap. So it didn't fit correctly.
Allow-for Sentence Examples
When the narratives describe the life of the young David at the court of the first king of the northern kingdom, when the scenes cover the district which he took with the sword, and when the brave Saul is represented in an unfavourable light, one must allow for the popular tendency to idealize great figures, and for the Judaean origin of the compilation.
The space a must allow for the inclusion of a copper spiral if the substance contains nitrogen, and a silver spiral if halogens be present, for otherwise nitrogen oxides and the halogens may be condensed in the absorption apparatus; b contains copper oxide; c is a space for the insertion of a porcelain or platinum boat containing a weighed quantity of the substance; d is a copper spiral.
In the first case the thermal effect of 58.58 calories actually observed must be increased by 2d to allow for the heat absorbed in splitting off two gramme-atoms of carbon; in the second case the thermal effect of 96.96 must be increased by d as above.
Napoleon, however, failed to allow for the psychology of his opponents, who, utterly indifferent to the sacrifice of life, refused to be drawn into engagements to support an advance or to extricate a rearguard, and steadily withdrew from every position when the French gained touch with them.