Lines showing up in Silhouette Studio but not in Illustrator

[#1]

I have created some files with clipping masks and those lines are showing up in Silhouette Studio but not in any other program. I can't highlight them in Illustrator.

How do I delete the lines in Illustrator? I have been having to open the file with Silhouette Studio and delete the lines.

[#2]

I have created some files with clipping masks and those lines are showing up in Silhouette Studio but not in any other program. I can't highlight them in Illustrator.

How do I delete the lines in Illustrator? I have been having to open the file with Silhouette Studio and delete the lines.

[#3]

I double-checked and they are showing up in the layers panel but just not showing up on the screen. 

[#4]

Highlight them in the layers panel and then click on the trashcan icon at the bottom of the layers panel.

https://helpx.adobe.com/illustrator/using/layers.html