Despite multiple pages created, tabs all go to main blog page

I can’t seem to work this one out on my own, so I’m hoping the experts will smile upon my WP question…

Location: https://www.statismwatch.ca
Problem: Cannot navigate away from front page of blog.

Details: First noted the problem after setting up two Pages to create tabs at the top of my blog for Home and a Forum. Clicking on either Home or Forum result in the main page reloading. Additionally, clicking any tags or categories has the same result. The blog stays stuck stubbornly on the main page. I have swapped in three different themes and three different forum plugins, so I’m fairly certain that the solution doesn’t lie in that direction.

Relevant settings
——————
options
WordPress address (URL): https://statismwatch.ca
Blog address (URL): https://statismwatch.ca
permalinks
updated religiously with each attempted change ??
pages
id 36 title Home slug home pageparent mainpage pagetemplate default pageorder 0
id 37 title Forum slug forum pageparent mainpage pagetemplate default pageorder 1
simple-forum manage options (just in case)
forum page id: 37
forum page slug: forum

I thought I’d covered all the bases, so – HALP! Thx.

Todd