Makes sense. The timing of it made me assume it was Rob’s sword, because it was just after the red wedding.

Normally I would rewatch and keep a close look for the details here, but… I’ll take your word for it

Didn’t his sword get melted to make the lannister ones? At the start of the episode after red wedding?

Didn’t Rob Stark ruin his sword hitting a tree? Or maybe Caitlen kinda forgot about valerian steel?