Different results for the same matrix on Linux and Mac

Dear all,

I've been using vcluster (2.1.2) on both Linux and Mac, and with the same input matrix, got different clustering solutions. The matrix is relatively sparse, but I wonder if that happens because of the differences in implementation. If I repeat experiments on one platform, the results remain the same. I'd like to use the stable version (2.1.1) on Mac, but as far as I understood, it is unavailable. Any help would be appreciated (I can also proved a matrix to reproduce this behaviour).

Thanks,
Sophia