Net annual return (NAR) measures the actual rate of return of all your investments since you started investing on PeerBerry (invested and not invested funds are taken into account). It also includes anything that affects your returns, such as delays and bonuses, and counted but not paid yet interest value.
At the beginning (if you have started investing recently) NAR is displayed higher or lower (depending on the invested amount), as counted but not paid yet interest value is included. Within a couple of months, NAR reaches the normal level/is displayed correctly.
NAR is calculated using the XIRR (extended internal rate of return) calculation methodology. More information about the XIRR and calculation formula can be found here.