Your search for "danterdum*" revealed the following:
Tofu cubes
from $109.99
Nylon resistant polymer compressible sponge+180T aerobic cotton+7D imitation velvet cotton+lamp core velvet
FOAM SOFA
Nylon resistant polymer compressible sponge+180T aerobic cotton+7D imitation velvet cotton+lamp core velvet
You renderd the snippet swatch.liquid with the name of a product option — 'size' — that does not belong to your product.
Use {% render 'swatch' with 'name of your product option here' %}
Example: {% render 'swatch' with 'Color' %}
This is case-sensitive! Do not put in 'color' if your product option name is 'Color'.