Different position for same gene using annotatePeak from ChIPseeker

Question

[QX]

Hi all,

I try to annotate peak with ChIPseeker, but the outcome show the start sites of a gene are differ for the same gene:

                      chr     start       end  SYMBOL geneStart   geneEnd
1:26233263-26235629     1  26233263  26235629   CEP85  26234200  26277687
1:26470149-26473811     1  26470149  26473811   HMGN2  26472440  26476642
1:27913903-27915369     1  27913903  27915369    RPA2  27892073  27914513
1:35748222-35748658     1  35748222  35748658   CLSPN  35746965  35748774
1:35768251-35770632     1  35768251  35770632   CLSPN  35736405  35769928
1:35771985-35772203     1  35771985  35772203   CLSPN  35732112  35769978
1:37573334-37573553     1  37573334  37573553    GNL2  37566817  37570893
1:37593320-37593538     1  37593320  37593538    GNL2  37590779  37594092
1:37595191-37596612     1  37595191  37596612    GNL2  37593485  37595935
1:75725766-75726947     1  75725766  75726947   ACADM  75726849  75763640
1:75741781-75743312     1  75741781  75743312   ACADM  75744318  75763483
1:93874059-93874743     1  93874059  93874743 DNTTIP2  93869780  93873369
1:93878084-93880000     1  93878084  93880000 DNTTIP2  93876759  93879156

for e.g: CLSPN have genestart at: 35746965, 35736405 , 35732112

I use the code from the tutorial:

peakAnno <- annotatePeak(macsPeaks_GR,
                        tssRegion=c(-3000, 3000),
                        TxDb=TxDb.Hsapiens.UCSC.hg38.knownGene, 
                        annoDb="org.Hs.eg.db")

Can anyone help me explain this?