Oxygen Theme – Front Page Not Displaying Like Others

I tried to make some changes to my website, in order to speed it up, and after doing so, the Primary Sidebar doesn’t seem to be working and the main menu doesn’t seem to be centralised.

This is happening on the Front Page – but not on the others?

I’ve tried changing things, and messing around with it, but don’t seem to be able to fix it.

I am new to this and am probably missing something blatantly obvious and very simple.

IF someone could point it out to me, I’d be very grateful.

https://www.thebeautifuldebate.co.uk

That’s the blog address.

Thanks in advance.