Safari doesn't load Kickstarter properly?
The URL https://www.kickstarter.com is not broken for Safari Version 10.0.3 (12602.4.8) out of the box.

You are clearly getting bad web content to render and the suggestions in the comments are all spot on:


This can be caused by web filtering / MITM (man-in-the-middle) type network meddling. You can test for that by taking your Mac to another network (coffee shop, public library, another country (not China or North Korea for instance).
JavaScript blockers could cause this. Disabling JavaScript does change the rendering of Kickstarter for me, but the breakage is far less than what you report. Yours looks like the CSS isn't even loading.
Check for CSS changes/overrides you have made to your browser or system.
Web Privacy plug in (or network level controls) could cause this.
Bad settings on your user account could cause this. To test that, make a brand new user account.


From your testing on Chrome vs Safari - it's highly likely you have a hostile network and/or software on your Mac that's rewriting the web content being served to you and breaking it.