Most distances in the flank_gene_distances column are 0

[rejo27]

Dear Pr Guangchuang Yu
I am using the ChIPseeker package to annotate the peaks of ATACseq.
The command is

txdb <- makeTxDbFromGFF("/Users/ltan/Documents/my.gff",format="gff")
peaks <- "/Users/ltan/Downloads/ATAC.peak.bed"
peakAnno <- annotatePeak(peaks, TxDb = txdb,tssRegion = c(-2000, 0), addFlankGeneInfo=T,flankDistance = 5000)

But I found that although there are multiple genes within 5000 bp upstream and downstream of some peaks, most of the flank_gene_distances columns are 0.
such as

I don't know why.
Looking forward to your reply