I'm sure this has been posted before but all that I have seen ALL have mods installed, I have no mods at all installed and yet I can't claim my flux from sold items.

For those who are unsure - I have sold items and when I click claim it goes grey as if it has been claimed but it will not give me flux. When I go onto the sold listings again, it's green as if I never clicked it. Again, I have no mods installed so what's the issue?