Currently the ordering of Assets is set on the ID number not the actual number of the asset.
The Register ID number is an automatically generated ID, dependent on what order the Assets are added to the system (the list automatically displays the latest added Asset, to the oldest added).
If you would like to display the Assets from oldest to newest, then you can simply click on the Register ID tab so that they will be in that order..(Note: this cannot be saved as a View, so you will need to select that column order each time.)
Assets listed within a form, will automatically display newest to oldest, much like the Asset Register. This is something that forms part of our ongoing Asset development however it is not scheduled to be changed yet.