I would suggest you unbuild one side and take the spokes out.
Look at the crossed pairs.
You need to notice that the spoke holes are out of phase with each other.
If you are inserting a trailing spoke, it starts at the spoke hole to the left (or right) of its opposite trailing number, and the nipple will fit in the corresponding left (or right) hole in the rim.
Basically the set of spokes on the 2 sides are identical, but one set is rotated 1/36 around!
I.e. the spoke holes correspond to the drilling on the rim.
This all needs to be considered before lacing.
If this is too condensed to understand, i would suggest you read a book on it.
Building wheels is simple enough, but there are a few geometric moves you have to make that aren't obvious to a novice. If you miss one, your equal spokes suddenly seem unequal!