1=> Please check your Mailing address in your Ecas, if it is different from your current mailing address, it would suggest to change it by raising CSE or check it process from your ECAS.
2=> Yes there is chance to send their query to your mailing address. So far I remember, it had happened to our one of forum member "Afsun1105" who got MR today.
3=> For my understanding is that due to lots of applicants file received by SGVO which are out of their capacity to process and finished within their due time, reason they sent some files to Manila VO and we know Manila VO is more than faster processing visa office in this region.
4=> You can order GCMS note from anywhere even BD. There is procedure and payment method, to know visit their website https://www.gcmsnotes.com/ or http://www.gcmsfile.com/
Hope above will help you.