Not very surprising, most probably floating point arithmetic inaccuracy again. When you assign 13.25 to a variable, you can't know for sure if the number stored internally will be something like 13.2499999999976 or rather something like 13.25000000000012. This will depend on the machine architecture and a few of other factors.

There may also be a difference with the libraries used. IEEE recommendation is to round the trailing "5" digit up or down depending on whether the previous digit is odd or even, but some libraries may still round up systematically.

Can you perhaps try again with 1325/100 to see if it makes a difference?