My DSL modem has a built in configuration web page and Safari does not render it correctly on my MacBook with Sequoia 15.1. Chrome, and several other browsers have no issue so I think it's got to be Safari. In this screen shot you can see how the images are overlapping each other.
MacBook Pro 16″, macOS 15.1
Verify that you have JavaScript enabled on the Safari 18.1.1 Settings > Security panel. With it disabled, all of the JavaScript that the site developers put into that site would not work correctly at the expense of your altered view. If you are running any extensions, and particularly security extensions in Safari, that may adversely impact how the site is rendered in Safari.
The other issue is that the web developers favored Chrome or Firefox browsers during that site development and gave little testing to current Macs and Safari or no Macs at all. In this case, there is nothing you can do but use a different browser.
Verify that you have JavaScript enabled on the Safari 18.1.1 Settings > Security panel. With it disabled, all of the JavaScript that the site developers put into that site would not work correctly at the expense of your altered view. If you are running any extensions, and particularly security extensions in Safari, that may adversely impact how the site is rendered in Safari.
The other issue is that the web developers favored Chrome or Firefox browsers during that site development and gave little testing to current Macs and Safari or no Macs at all. In this case, there is nothing you can do but use a different browser.
I have resorted to using Chrome, as all the settings you mention are as they should be. It's the properties for the objects that aren't working correctly. The positions are off and so they're overlapping each other obscuring information. It's the management software for my DSL Modem, so I doubt that they do much testing.
Safari not Rendering webpage Correctly
