Lily beetle alert- at 11 o'clock
Very well spotted!!! Can the original poster see the little red beetle in the leaf axil.
The leaves on other nearby stems all look in good condition. So why does just that one stem appear to be like that. That stem obviously comes from a different bulb. I wonder if it's a different variety of lily.
Very dark red lilies do sometimes develop a reddish tinge to the leaves, although if the buds are falling off, there's clearly something wrong. I'd suspect maybe a virus of some kind.