Every conventionally laced wheel is built with a multiple, repeating pattern of 4 spokes. 2 crossing on one flange, and a similar pair on the other one spoke hole away in the rim.
The 4 spoke motif is repeated a number of times depending on the number of holes, ie 8x for a 32h wheel. Everything should be uniform and repeat identically, usually with the spokes woven over/under at the last cross.
If your wheel has most, but not all, spokes woven over/under at the last cross, the non woven ones may have been replacements done by a sloppy mechanic.
In any case a whee is a model of repetition and uniformity, so either switch a few spokes if that'll solve the issue, or relace completely.
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