Web Pages acting weirdly in Safari. (All other Browsers tested, the web page acts weirdly only in Safari for macOS)
Reload from Origin

Try asking Safari to reload all the page resources from the origin server. Do this with the hidden menu item:


  In Safari, hold down the Option key and select View > Reload Page From Origin


This will ensure that all the files are downloaded from the original web site and not from various caches. Occasionally an out of date cached file can conflict with a partly reloaded page, causing the strange layout you are seeing.