Sorry for the untimely reply.
Please let me know the Settings you’ve set for Settings >> Reading >> Your Front Page
My guess is, you’ve selected your posts page to be the blog page you’ve created.
If so, WordPress only uses this for the permalink purposes, other than that it would ignore you’re settings for the page “the sidebar”
So to amend this.
Please go to Settings >> Reading
And set the
Front page displays
A static page (select below)
and set the front page to be that of the blog page you’ve created,
and set the blog page to nothing
Please let me know if I guess wrong, and kindly allow me admin access to check it out for you