Problem with the last update

Good evening,
After the last update my website has gone completely mad.
Until the update was the same as the Demo theme base site, now I find the product image that does not respect the dimensions, the buttons to add pieces that has become huge .. and the bar at the bottom (Description, Reviews, Shipping) ) that no longer exists and the names are split.

I ask you to resolve as soon as possible, the site will be active from next week … so I can’t get it started.

I attach screenshot

Yours sincerely
Luca