same code, same library version, same compiler, different output

File h.cpp

#include "yaml-cpp/yaml.h"
#include <iostream>
int main() {
    YAML::Node node = YAML::Load("[1, 2, 3]");
    std::cout << node << "\n";
    std::cout << node.Type() << "\n";
    std::cout << node.IsSequence() << "\n";
}

compiled and executed with

g++ -lyaml-cpp h.cpp && ./a.out

yields

[1, 2, 3]
3
1

on my desktop, but

[1, 2, 3]
1
0

on my laptop. The last line of laptop output is wrong: For sure, the given YAML string is a sequence.

Same results when g++ is replaced by clang++. Both machines run the same Debian 4.18.10-2, both are x86_64, both run Linux 4.18.0-2-amd64, both have same versions of g++ and clang++. Both have the same yaml-cpp library versions, freshly reinstalled:

$ locate libyaml-cpp.
/usr/lib/x86_64-linux-gnu/libyaml-cpp.a
/usr/lib/x86_64-linux-gnu/libyaml-cpp.so
/usr/lib/x86_64-linux-gnu/libyaml-cpp.so.0.5
/usr/lib/x86_64-linux-gnu/libyaml-cpp.so.0.5.2

$ dpkg -S /usr/lib/x86_64-linux-gnu/libyaml-cpp.a
libyaml-cpp-dev: /usr/lib/x86_64-linux-gnu/libyaml-cpp.a
$ dpkg -S /usr/lib/x86_64-linux-gnu/libyaml-cpp.so.0.5.2
libyaml-cpp0.5v5:amd64: /usr/lib/x86_64-linux-gnu/libyaml-cpp.so.0.5.2

$ apt-cache show libyaml-cpp-dev
Package: libyaml-cpp-dev
Source: yaml-cpp
Version: 0.5.2-4
$ apt-cache show libyaml-cpp0.5v5
Package: libyaml-cpp0.5v5
Source: yaml-cpp
Version: 0.5.2-4

Output from ldd is identical except for the hex addresses in parentheses:

$ ldd a.out
    linux-vdso.so.1 (0x00007ffd0d5f0000)
    libyaml-cpp.so.0.5 => /usr/lib/x86_64-linux-gnu/libyaml-cpp.so.0.5 (0x00007f1e9fcd8000)
    libstdc++.so.6 => /usr/lib/x86_64-linux-gnu/libstdc++.so.6 (0x00007f1e9fb55000)
    libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f1e9f9c1000)
    libgcc_s.so.1 => /lib/x86_64-linux-gnu/libgcc_s.so.1 (0x00007f1e9f9a7000)
    libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1e9f7ea000)
    /lib64/ld-linux-x86-64.so.2 (0x00007f1e9ff79000)

What possible explanations remain in such a situation?