The reason is that the commandments are not clearly numbered, so it is a matter of interpretation when one commandment ends and the next begins. Different ways of splitting the commandments leads to different interpretation.
In Jewish interpretation the second commandment starts with "do not make an image...", in Catholic and Lutheran interpretation this is part of the first commandment, giving it less emphasis. The numbering of the rest of the commandments are then one off, until the ninth/tenth, which is two separate commandments in the Catholic interpretation.
In Jewish interpretation the second commandment starts with "do not make an image...", in Catholic and Lutheran interpretation this is part of the first commandment, giving it less emphasis. The numbering of the rest of the commandments are then one off, until the ninth/tenth, which is two separate commandments in the Catholic interpretation.