If you are seeing an unbelievably high return, this is because you received income very soon after you purchased. The percentage is calculated by taking the amount of income over the amount of time you have owned the asset. Since you will have owned the asset for a very short period of time, the return appears to be very high. As more time passes this figure will normalise and within 6-12 months you should see the predicted returns when you purchased. This is not an error, rather that the returns appear skewed in the short term.