Component entry seen in "Component table" but can't see them in "Setup Design"

Hi all,
Normally, if we create a Component, its entry goes in the Component table. Here, I have come across one ism file in which, I can see few entries in the Component table but the corresponding components are not seen in Setup Design.

So how did those entries get in the Component table? Will the files in those Components go on the system?

Thanks in advance,
Shodhan