Absolute Error Bound Exceeded

[Gyhanis]

I wrote a testing program, and found that in some cases the error of SZ(v2.1.12.2) exceeds the absolute error bound.

$ ./sz_test < data
data len: 171840
compressed len: 97787
Error at 66559: 116.3225489999999951 vs 116.3225589999999983 (diff: 0.0000100000000032)

The exceeded error is so close to the error bound that I believe it is caused by floating point computation.
I would like to know that whether I'm using SZ in a wrong way, or it is just a bug.
The testing code and data are in the attachments.
Thanks.

CodeAndData.zip