Ronno,

Just to give you some added insight, changes in center to flange distance affect spoke length on a roughly 10:1 ratio. For every 10mm change in CTF distance you'll get 1mm of spoke length change.

Rim ERD changes are 1:1 with spoke length, and changes in cross typically add/subtract 3-5mm but this varies with flange size and the number of crosses.

Hub spoke circle changes spoke length differently depending on the amount of crosses, ranging from zero on a full tangent (36h/4x, 28h/3x, 20h/2x) to 1:1 for radial pattern. On a typical 3x build the change is roughly 1mm less spoke length for every 3mm more of spoke circle change)

Most cases of error as large as yours are either ERD errors because of entry or database error, or building one cross more or less than what was used in the calculation.

You can also get issues if the flanges are built out of phase, but this won't be uniform, and you'll see a classic hi/low effect on alternating spokes on the same flange (or both flanges producing a hi-hi-lo-lo pattern). I'm assuming this is not your problem since you describe the spokes as uniformly short.