Fork low on oil.....or?

Recently got the forks rebuilt on my 2014 Husky FC450, I also had them put some softer springs in as well. Anyways when the bike is on the stand I can hear the spring rattling around in the fork tube. It also has felt like I had either a flat tire or my handlebar mounts were loose, I checked both and nothing was loose. I am starting to wonder if the guy that did my suspension didn't put enough oil in the fork or if they didn't use the correct spacers for the new springs. Has anyone ever had something like this happen before? I am not super familiar with fork internals so I thought I would see if anyone could help out. Thanks!

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