Can edit some pages on Android, can't edit others.

I'm trying to figure out if this is something specific to my Galaxy S4, something with the site redesign, or maybe both.

Ever since the redesign, I've noticed that my keyboard input on certain pages gives absolutely no response except when I hit the backspace key. I can delete characters, but cannot add any characters to the page. For example, Pokemon Ruby And Sapphire and Teen Titans Go.

Other pages, like Ace Combat Assault Horizon Legacy, give me no issues at all. The past 5 edits I made to that page were all from my mobile.

Typing on the forums has never been an issue though. Anyone else notice this?

I've had a sort-of similar issue on iPhone where I can't see where I'm moving the insertion point to, and then when I start typing the insertion point seems to be a character behind. Also only occurs on some pages and not others, and definitely predates the redesign, but really discourages me from editing on iPhone.

I think one of the issues is that the pages are quite large. Not large enough to need a hard split, but still large.