A question of pacbio CCS lost too much after DADA2

Hi everyone,
I used DADA2 to analysis my CCS data. But most of the reads were denoised. Is that normal?
My code:

qiime dada2 denoise-ccs --i-demultiplexed-seqs all.qza --p-min-len 1000 --p-max-len 1650 --o-table bac_table.qza --o-representative-sequences bac_seq.qza --o-denoising-stats bac_stats.qza --p-front AGRGTTTGATYNTGGCTCAG --p-adapter TASGGHTACCTTGTTASGACTT --p-n-threads 0

bac_stats.qzv (1.2 MB)