hello, I think it's a bug.
set pdf417param.options whit PDF417_FIXED_COLUMNS and pdf417param.codeColums=3
the pdf417 code is wrong. and not looks like a pdf417code.
but if not use PDF417_FIXED_COLUMNS or pdf417param.codeColums is not 3. there are no problem.
the c code is:
p.text = "pdf417 text";
p.codeColumns = 3;
p.options = PDF417_INVERT_BITMAP|PDF417_FIXED_COLUMNS;
the attach file is compare between use PDF417_FIXED_COLUMNS and codeColums=3 and not.