You bought a stereo adapter rather than a mono adapter. You can see it has 4 rings, not three like the iPad headphone plug. It doesn't matter if it thinks the earphones are connected, because you likely don't about hearing it if you are recording. The problem is the mic contacts don't line up correctly.
What kind of microphone are you using?
I'm not sure. The TRRS connector is (I believe) what the iPhone uses but I'm not certain about the iPad.
Let's back up though. Are you ABSOLUTELY certain that...
- The mix is output through the 3.5 jack? You can test by plugging in headphones to be sure it works.
- If that works, are you certain the cable you are using to output into the adapter is in good condition and working?
- The adapter is really TRS --> TRSS?
The output is on the second photo, it's the cable on the right so yes, it's an 3.5mm Jack, i've tested with headphones and there is no problem with the mix table.
I have tested with 3 different cables ^^ So no problem with this
I bought the adapter on this website, if you want more info :
( French website )
It says it's compatible with Iphone but i think that the audio connectors are the same for Ipad, no ?