No, I'm pretty sure I installed it correctly. The first photo shows only the small chainring. The second photo shows both of them with the sensor sandwiched in between them.
The app shows me there is a firmware update available. I have 1.8.6 installed and 191 is available. Should I do it?
Got it, sorry for misunderstanding, you should upgrade, this is not like the iOS, I upgrade the SRAM firmware or powermeter firmware all the time, if they update it means they really fix something, haha.