BUCKLING ABABAQUS LANCZOS vs SUBSPACE

[verians]

Hi everyone,

Why am I obtaining differents eigenvalues for the same model, using either Lanczos or Subspace method?

When I use the lanczos all the eigenvalues are positive, but with Subspace all of them are negative. They are not similar at all.

Please help me to understand this.

Thanks in advance.