Game Mode Switch Not Working

I switch game modes sometimes, usually swapping away from ranked BRs in favor of arenas or trios. I have had many times where I try to switch modes and queue up for a different mode, but I end up getting tossed into the mode I switched away from. Sometimes this happens on my first game after boot when I switch from the default trios to a different mode. While I'm queued up it shows the mode I want to play, but it ends up putting me in a different mode. It isn't clear how long I have to wait to avoid this issue, so sometimes I give the game some time to figure out what's going on, but I still end up playing the wrong game mode. On PC.