Unexpected page related with "Link to the scheduler"

Scheduler Javascript
#1

Once I installed , nominal page (i.e., no real page is created) with name “scheduler-calendar” was created on our main blog page. Because this is not a real page, even though I click this menu, I got “Sorry…The page doesn’t exist…”.

Even though I uninstalled , no change.
Furthermore, I got another nominal page when I clicked “restore default” button / setting / scheduler / Plugins menu after 2nd installation.

Please help me!
This is our commercial site!



#2

Pages, created by scheduler can be managed in Admin section of site, in Pages area.
Those pages are normal WP pages, so they can be deleted in the normal way.

P.S. There was a similar case, when deleted page was not fully removed - it was caused by some other plugins, which are caching list of existing pages.