Strong signals often cause weaker "images" at different frequencies in the WSPR display. The underlying cause is still not understood. But now spots with the same callsign will only have the strongest one uploaded to prevent polluting the wsprnet.org database. You'll still see multiple spots in the WSPR viewer because they are displayed incrementally as they are decoded. But at the end only the strongest non-duplicates will be uploaded.
A multi-pass scheme has been implemented to help decode weaker signals. After the first pass any remaining signals will be rerun through the decoder with increased effort parameters (that take more decoding time) until the full two minute decoding interval is exhausted. Previously decoding was stopped after only one pass.
The main KiwiSDR control panel at the bottom right of the window finally has a "hide" button at the top right like the other panels. This should be helpful for iPad and other mobile device users.