Unexplained change in UMAP

A few months ago, I did an analysis, today I rerun the same bit of code :

sc.pp.neighbors(sco, use_rep = 'integrated_scvi')
sc.tl.leiden(sco, resolution=0.70, key_added='cluster_int')
sc.tl.umap(sco)

But the UMAP have changed, not the number of clusters or the number of cells per cluster, just the global look of it and I cannot find any explanations.

Thanks for your help !