This is normal but if you install the following builds for sdr#
SDR# Dev (Continuous Integration, Last Changed Rev: 977 )
SDR# RTLSDR Plugin (Continuous Integration, Last Changed Rev: 977 )
it should go away if you select one of the options under the rtl-usb settings. Im not on my main machine but when i do get on it i will tell you what setting it is if you don't already find it yourself.
Uniden 996P2•SDRPlay-RSP•Afedri SDR-Net•Baofeng UV-82L•Baofeng UV5R