Marek F405-WMN won’t disarm

Hello all,
I’ve run into a perplexing problem. My Matek F405-WMN will not disarm. I’m using MP and have all arming 0’d out but it still arms. QGC is the same. The disarm command in MP is rejected and so is the forced disarm command. Everything else is working perfectly, including Yaapu, Avatar OSD and data to MP. I can try reflashing with the latest but wanted to see if anyone here had some ideas first.
Thanx in advance.