Is this misprint at 2.5.8 example from [NIST SP800-22 Revision 1a.]?

I am reading the paper, NIST SP800-22 Revision 1a, which is about Randomness Test suite.

This is the link where I found, and read.

I summarized my question at the end of post. And below description is how my deduction drawn. And also, I haven't found misprint about 2.5.8 Example yet.

2.5.4 Test Description

χ^2 is calculated as above equation.

2.5.8 Example

It is very nice of Example to show all variables. But, sadly, I cannot get χ^2 = 1.2619656 as expected. And I think this is misprint of this paper.

the reason why I think misprint

1. I got χ^2 = 1.262580416458114

2. I double-checked whether my code is wrong with golang new(big.Float).SetPrec(500)

3. I triple-checked with Wolfram Alpha which is online equation calculator as below captured image.

Question

1. Am I wrong?

2. If I wrong, what is the reason why I cannot get precise answer?
   (I don't think this is precision problem of floating-point or just simple mistake)

3. If this is misprint, how can I report this?

4. Or, 4 decimal places error, 1.262580416458114 - 1.2619656 = 0.000614..., is within the margin of error in the system of Randomness-test?