Normal when add the script to chart

Goes above the bar when moving a little vertically

plotshape(buy, "Buy", style=shape.labelup, color=color.green, location=location.belowbar, text="buy", textcolor=color.white, size = size.normal)
plotshape(sell, "Sell", style=shape.labeldown, color=color.red, location=location.abovebar, text="sell", textcolor=color.white, size = size.normal)
How to solve this problem?
I removed the scale= scale.none from indicator() version 5