plot in R not displaying color scale values at the edges of color scale,

brks <- seq(1, 5, by=1)
nb <- length(brks)-1
cols <- brewer.pal(nb, "Reds")
pal <- colorRampPalette(cols)
png(file="frequency plot 2020.png",width=13.5,height=12,units="in",res=300)
plot(r3,col = pal(nb),legend.width=1.4,breaks=brks,legend.shrink=1, axis.args=list(at=seq(0, 5, by=1),
labels=seq(0, 5, by=1), cex.axis=1),xlab="Longitude",ylab="Latitude",main=" Frequency of HW in 2020",legend.args=list(text='No.of heatwaves', side=4, font=2,line=2.3, cex=.8))
plot(data.shape, add=TRUE, lwd=2)

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