This is intentional. Less data in the OSC stream means less for the phone to process and less data streaming over the Wifi network. The UDP protocol is designed for streaming data, but it is also designed to allow for packet loss, which is obviously not ideal when capturing EEG data!
Since bandwidth values are calculated from the raw EEG (which is included in the OSC stream per channel), really you don't need them included at all.
I will look at adding an option for individual values in the OSC stream, but I'll need to run some network tests on lower end devices to make sure it doesn't overload them.
Please email me using the support button at the bottom of the in app help, which will send me your device specs and I might be able to send you a beta version with this feature fairly quickly.