Respected scientist. After conversion, some CDS and exons were lost

[helloworldABCD1234]

awk '{print $3}' 1.gtf | sort | uniq -c 1.gtf
17909 3UTR 22746 5UTR 160456 CDS 170728 exon 17801 start_codon 17824 stop_codon 18968 transcript

gffread -T 1.refGene.gtf -E -o 1.refGene.gff -F

awk '{print $3}' 1.gff | sort | uniq -c 1.gff 160385 CDS 170601 exon 18968 transcript