Hello there! The mysterious moving chatbox has been reported, and we've alerted the relevant parties. Until a solution is worked out, have you tried entering gamepad/mouse mode and moving the chatlog manually? On default controls, you'd press L1+R3, then use the right stick to move the cursor over the "General" chat tab, then hold L2 and use the right stick to move the log to the desired location. If you are unable to move the chat log, please be patient while a solution is worked on. Thank you for your report!