In Android/build.gradle replace this:
maven { // <---- Add this block url "https://github.com/jitsi/jitsi-maven-repository/raw/master/releases" }
with this:
maven { url "https://github.com/aligol20/jitsi-meet-fix-android-sdk/raw/master/releases" }
next:
cd android & ./gradlew clean
then run the app, and now buttons become normal!