Losing all materials after Unwrap

[Megara18]

Hi! I love UVgami, from all the addons that i have this is by far the best one for unwrap, even better than the paid versions, i just encounter a tiny problem:

Normally i do the mesh and in low poly i add the materials that i like, then i add with InstantClean more faces and tris and then the UVgami for fix all the UV problems and end up having a really smooth output, the problem with this is, after i use UVgami the materials disappear and only remains one of them, is this a normal behavior? I link 2 pictures