"Mixed Hardwood" not otherwised specified will frequently be mostly Gum and Poplar . If it consists of substantial portions of Oak, Hickory, etc , it will be advertised as such, generally for premium price.
And "seasoned " is a matter of buyer beware . I have literally watched a tree go from being a live growing tree, to being offered for sale as " seasoned firewood" in less than 24 hrs .
True but many woods will literally "bleed" water when first cut. Poplar has that greenish tint if split, I can live with gum as long as I don't need to split it.