Hello, I fixed 2 things in the newly added roundabout:

1. It was missing the roundabout tag.

2. You mapped the lanes separately but only for a few meters, and then they converge. In my opinion, you should either stick to mapping the two lanes as one line, or map the two lanes separately for a larger portion (ending at some junction)

Here is the roundabout after the update:

https://www.openstreetmap.org/way/1418854573

Here is a nearby example with two lanes mapped separately.

https://www.openstreetmap.org/way/77355813