They do not update the status on time regularly. Sometimes, the status shows correctly sometimes not. If it showed 'In Process' then it would mean that your docs are in process. If it shows that received only, then it might be in process, might be not in process.
But a while ago we did recieve an email from Vienna that they required a 'statutory declaration of common law union', but I've already send it to them in the middle of November.
Same for me... went straight from application received to DM... in your case you know that they are working on your file because you have been asked for extra documents, so they are working on your file - just not updating ecas about it!
Good luck,
Sweden