In singleplayer, the Multiplayer button usually has a chest icon affixed to it indicating whether your next ranked match in PvP will give you a brown, gold, or purple chest. Here's what I have right now: So, in PvP I should be on a gold chest, right? Wrong: These screenshots were both for my account (IGN: Flaxative), taken within a few seconds of each other, and when I went back and forth between campaign and multiplayer a few times the behavior remained consistent(ly wrong). Hope this helps!
This is an ancient bug, many times reported, never fixed so far. Ultra-low priority. Very well reported, in any case!
No need to be sorry, I've done the same thing many times. Isn't it better that problems are reported >1 times than <1 times, after all?