it’s very common issue that after theme or plugin update you have some problems on site. In 95% it’s because you have cache system on site. So, when you update theme, it will have another code for modules, but css and other static files are the same as early (because they are cached), this can create incompatibilities.
So, you need to clean whole cache on site after any update, change or customization.
Problem is that many hostings also have inner cache system, so, I will show most common cases.
How to clean cache on hosting cache system
GoDaddy / Media Temple
Click “Flush Cache” link in the WordPress admin bar
Here you can purge cache in most popular cache plugins. First of all, go to Settings of plugin
Wp rocket cache
W3 Total cache
Wp super cache
If you use any CDN system, you need to clean cache there also
Some files can be saved also in browser, for example, css files. Here how to update
- Chrome: Clearing Your Cache
- Safari: Clearing Your Cache
- Firefox: Clearing Your Cache
- Internet Explorer: Clearing Your Cache
Don’t clean cookie, just clean images, files from browser cache