I have a sample site template (.wsp) that a vid course I'm taking gives me. It says to upload it to the solutions gallery. It uploads. I press activate from the solutions gallery form and it "seems" to activate and it shows as activated in the Solutions library. I go to use this site template to create a new site, and the template shows up on the list. When I select it and try to create it, it tells me that it has to be activated at the site collection level. I check the site collection features to manually activate it, and it is nowhere to be found. I'm guessing this is a sandboxed solution. I checked to see if the sandbox solutions service is running in Central admin. It is. It is also shown as started in my windows services. I may have uploaded this same solution a while back, but I don't think I did but I can't be sure. But I never saw any trace of it before I just uploaded it.
Does anybody know what could cause this odd behavior? If I did upload it in the past and deleted it, would that cause a problem like this?