Magento 2 and theme needs fix

My magento website have been upgraded from magento 1 to magento 2 with a new theme. after migration magento experienced some minor issues with the theme and magento 2.

Not exactly sure about where the issue is but have few minor things like unable to connect to marketplace, adding new extensions and upgrading commands from ssh just brakes the website.

Theme have some issues like lost default blocks, pages, every front end builder update brakes page and applies changes.

Need an update in checkout field input type to dropdown.

Its a small issue but need to be sharp to figure out and fix it.

can supply with all the theme files and extension files.

http://dev.yerbamateaustralia.com.au