RAM info not the same with Dokploy monitoring

Hello, I've got a 8Go of RAM VPS. But somehow Dokploy just show a random value (0.35 Go) in the monitoring chart. I did the "free" command in the terminal vs in Dokploy admin. on this particular VPS there is the bug, but not another one with a Dokploy instance too. Is there a way to force/analyze RAM available in order to be accurate? Thanks