Can't view main page but subpages yes

Hello,

I’m having troubles viewing my main page but am able to view any subpages relating to it. I believe something wrong has gone on in wordpress.

Please advice urgently?

My website is: https://www.slakkiemarket.com
The front page is saying under construction.

Also when I change my theme it only changes in the subpages and not on the main page.

Thank you