Double points means they didn’t use the previous years points allocation and they banked them into the next use year. Ex 100 - 2020 points were not used because of Covid to they added them to their 2021 points for a total of 200 points to be used in 2021. If the 100 points from 2020 aren’t used in 2021 they expire. However the 2021 points can be banked forward into 2022
It should mean that there are current and banked points with the contract though it often also shows this way when there are only current UY and forward points but the calendar year has changed.
It’s a learning curve but once you get the hang of DVC lingo it gets easy to manage the points. Right now too with Covid some normal dvc points things have been paused but should return soon. Right now you can only borrow 50% of your points from the future year, because of the concerns that’s there’s more points at play due to the resort closures and vacation cancellations. You can also cancel last minute with no penalty on your points because they don’t want people to travel sick with Covid.
The good news is you don't go on vacation all that often so you do have time to think about it and strategize how you are going to use your points. I will say though, we had a long-term strategy for our points and that got pretty scrambled when we decided to extend our stay on-property at the last minute (didn't want to stay off-property with COVID happening). We should have rented someone else's points instead as LOTS of people we cancelling and points were getting pretty distressed - could have got a really good deal renting and preserved our points.
