Trouble with YouTube's Channel-specific Search Bar - Showing Unrelated Content?

I've been experiencing an odd issue with the search bar on individual YouTube channels.

Lately, when I try to use this channel-specific search feature, it's been showing results that aren't even related to the content creator's uploads. It's almost as if it's pulling results from the main YouTube search.

Has anyone else noticed this or found a way to address it? Any help or insight would be greatly appreciated. Thanks