Title – bar text does not show up correctly when browsing the archives

I just move on to the Able theme and all seems to work except for when I browse the archives, the title seems to be showing a variable/placeholder (%archive_title%) instead of a proper title.

To have a look at it, head here: https://webguy.in/2015/03/

Any help to point me in the right direction would be great.

Thanks,
Rajiv