ok, I am not going insane then.
I live in a resort area and during high season I use an additional booking site that does not link automatically to Airbnb. I am extremely meticulous with my calendars to avoid any issues. Dates that I blocked (and included notes on stating they were booked on the other site) became unblocked. I am a Superhost and contacted Airbnb - which is a teeth pulling, absolute, horrific, gut wrenching experience all in its own - and was assisted with a gentleman that explained I would be contacted by a "manager" to resolve the double booked dates. This "manager" started messaging me day 2 after midnight EST (day 3) when I specifically requested I be called, preferably sometime before the sheep start getting counted for the night. It was awful. She was horrible. I was told it was MY FAULT for having instant book on. I was told I cannot use instant book feature. I was told I wasnt updating my calendar. I was told I can no longer use instant book (which then I could lose out on potential guests using this filter option). I was furious!!! Sorry for the bit of a rant there....
I love Airbnb and it offers really cool features but some serious program upgrades are necessary to accomodate all of the bells and whistles prior to rolling them out. ESPECIALLY if the customer service is so flimsy, weak, and essentially non-existent.
To avoid the issue I turned off the instant book option and I check my calendar EVERY SINGLE DAY. And I hope that the folks behind the curtain turn off the smoke machines and face the music - fix what is broken so we can all start singing "there's no place like home" again.