Nested Expand Not Working

Running WP V 4.2.2.

Installed Collapse-O-Matic. Nested Expand elements half working. Copied and pasted the code directly:

[expand title=”Root Level”]
[expandsub1 title=”Nested Level 1″]
[expandsub2 title=”Nested Level 2″]
[expandsub3 title=”Nested Level 3″]
[expandsub4 title=”Nested Level 4″]
[expandsub5 title=”Nested Level 5″]
[expandsub6 title=”Nested Level 6″]
[expandsub7 title=”Nested Level 7″]
[/expandsub7]
[/expandsub6]
[/expandsub5]
[/expandsub4]
[/expandsub3]
[/expandsub2]
[/expandsub1]
[/expand]

Outputs the regular “Root Level” title, but when clicked and expanded it displays the actual code, instead of the “Nested Level 1” “Nested Level 2” etc.

Please advise. Thank you!

https://wordpress.org/plugins/jquery-collapse-o-matic/