Thank you for your post and welcome to the forums.
This happens when an order is placed online, and it needs to go through extra checks. Unlike when you do this on the phone, an agent is able to provide the information there and then. If the team needs more information from you, they would usually contact you in 24-72 hours, if not the order would be released. The other reason why this may be parked would be because the credit check had failed.
Can I ask if this is still the case for you at the moment? If not let me know and I can take a look for you.
Ryan_N - Forum Team - https://community.virginmedia.com/t5/custom/page/page-id/WelcomeGoodFolk