This should not have happened.
Look at the URL bar. Click on the URL bar.
You might think you're on simon.com, but you're not.
Your browser can turn a Punycode address into a convincing Unicode lookalike.
Punycode address
xn--smon-08b.com
Browser display (Unicode)
sɨmon.com
This is not simon.com.
The second character is ɨ (U+0268),
not i.
Both forms above identify the same registered domain.
A massive phishing disaster waiting to happen.
The automatic rewrite hides the obvious xn-- prefix and
replaces it with a name that can pass for a site you trust.