>When you open the "Killer and Victim" thread in /rp/, the last two post aren't shown - they still show up if read from the main /rp/ page.

Apparently the issue fixed itself.

>Also, instead of an up arrow in the bottom right of the screen my phone shows just a box with an x inside

Something is wrong with the font used by your phone. Guess I'll have to switch to FontAwesome someday...

>Was wondering if there is an archive of older literature?

Not really. There may be a bunch of archived threads not shown anywhere, and eventually they will appear as proper archive, but those date back to a couple of months ago at most.