DON'T PANIC.
This is how Bristol does things. They score applications and rank them as they come in and start making offers gradually from the top of the list. The score threshold for offers is gradually reduced and once January arrives/they have all the LNAT results, offers happen more quickly. Some offers may not be made until March/April - hang on in there, if you have not been rejected you are still likely to made an offer as the process goes on.
So - its just a system of 'parking' applications with a view to a later offer. You meet the entry requirements, your LNAT is acceptable, they have scored your application. Unlike many other Unis who just go quiet on you, Bristol actually tells you what is going on.