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@qwerty920125 It seems you are not using English, I've helped translate the content automatically. To make your issue understood by more people, we'd like to suggest using English next time. 🤗

TRANSLATED

TITLE

When the horizontal longitudinal axis type is Value, the data exception after setting Stack is set.

BODY

Version

4.9.0

Steps to reproduce

option = {
	xAxis: {
		type: 'value'
	},
	yAxis: {
		type: 'value'
	},
	dataset: [{
		source: [{
			"time": 0,
			"survival": 1,
			"lower": 1,
			"upper": 1,
			"diff": 0,
			"offset": 0,
			"nrisk": 224
		}, {
			"time": 0.0025,
			"survival": 1,
			"lower": 1,
			"upper": 1,
			"diff": 0,
			"offset": 0,
			"nrisk": 223
		}, {
			"time": 0.016666666666666666,
			"survival": 1,
			"lower": 1,
			"upper": 1,
			"diff": 0,
			"offset": 0,
			"nrisk": 222
		}],
		dimensions: ['time', 'survival', 'lower', 'upper', 'nrisk', 'diff', 'offset']
	}],
	series: [{
		datasetIndex: 0,
		name: 'groupName_L',
		type: 'line',
		step: 'start',
		encode: {
			x: 'time',
			y: 'lower'
		},
		itemStyle: {
			color: '#333'
		},
		areaStyle: {
			color: '#333'
		},
		stack: 'groupName',
		symbol: 'none'
	}, {
		datasetIndex: 0,
		name: 'groupName _U',
		type: 'line',
		step: 'start',
		encode: {
			x: 'time',
			y: 'upper'
		},
		itemStyle: {
			color: '#ccc'
		},
		lineStyle: {
			opacity: 0
		},
		areaStyle: {
			color: '#ccc'
		},
		stack: 'groupName',
		symbol: 'none'
	}]
};

What is expected?

Draw the upper and lower two lines, and the area between them is dyed a specified color, which should be similar to the result of xAxis.type.'catrgory'
! (Expected results) ( https://user-images.githubusercontent.com/4928881/110914130-ee166700-8350-11eb-9493-26498996424d.png )

What is actually happening?

The data that is superimposed changes the values of x and y at the same time, causing the two points that would otherwise correspond to the same x value to not be on the same vertical line
! (Current results) ( https://user-images.githubusercontent.com/4928881/110914113-e6ef5900-8350-11eb-8c81-35b4c5db261e.png )