Usually the first couple of days of a runner's life, they don't stand up that straight... Not enough to notice. And when they start standing up right, they don't do it often. They usually sit squatty like any other duck, esp if they are not show quality.
fawn and white runner ducklings should be almost
all yellow with a slightly darker yellow or tan patched on their chests and around their faces. They shoud have
orange feet/bills... They should NOT have black feet or black bills. And they def should not have dark eye stripes.
Here's my fawn and white runner when he was little-
Here he is day old- see the tan on his face? Definitely not stripes
In the tub, maybe a week old?-
Standing up right- he's maybe a week old here-
Here's one of him maybe two and a half weeks old-
I hope this helps!