Why does powdered shallots stick at the bottom of the vial?

Does it happen to anyone else and does anyone know why it happens and if it means it's gone bad or it's safe?

It's the only spice in my kitchen, and I have many, that acts weird and google wasn't helpful on this one.

It becomes one solid block at the bottom and I would need a knife or something sharp to go tear at it and break clumps off from it again. But I'm not sure it's still safe to eat.