When you load an html doc into a webview it will take the viewers width as 100%. When you chang to landscape mode, and as a result the viewers width increases, so will the document inside. However, when you go the other way around, the document will stay wide while the viewers width decreases. This causes all sorts of issues. Need to reload to fix the issue…
For me is behaving just fine.
Maybe is something you are doing that is causing this.
It's happening to me too.