urdfdom_headers uses std::stod to parse floating point values like position (xyz) and rotation (rpy) from URDF files. The result of std::stod is locale dependant. So with e.g. a German locale (de_DE.UTF-8) "1.57079632679" is parsed to 1.
This is the case in urdfdom_headers/urdf_model/include/urdf_model/pose.h Line 70 (not necessarily exclusive)

In my opinion the issue described here can be linked to this error, as can be the issue described here.

This link states that "[...] using a stringstream to convert it worked perfectly fine."

If desired I can fix this issue using stringstream and create a pull request, but I have to admit I have no background knowledge in ros package building and testing procedures.

Cheers