When you had gone to a site using a deep link, Safari insists on autocompleting any URL in the domain to that link you used even if you just want to go to the top-level URL/index of that site. You have to type out the entire URL and add a space at the end or something (and that still doesn't work sometimes) to stop iOS from doing that, which defeats the entire purpose of autocompletion. Btw switched off any autocorrection feature a long time ago. Still, I happen to mistype a lot compared to my old non-Apple phones (there was even an "it's not just you" article last year about it).

Apple needs to spend an entire release cycle to unfuck text entry and completion. However, with their qa lately (or lack thereof) they'd only manage to make it worse. The sad thing is they're still better than the alternatives, all things considered.