'FFMpeg adding automatic Beep sound at specific seconds

merging two audio files using ffmpeg but it's adding slight beep voice on specific duration everytime. Can we remove this?

ffmpeg -y -i 1.wav -stream_loop 23 -i Wav_868kb.wav \
  -filter_complex "[0:0]volume=2.5[a];[1:0]volume=0.5[b];\
                   [a][b]amix=inputs=2:duration=longest" \
  output12.mp3
audioffmpegffmpeg-php


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