IndexAxisValueFormatter behaves not as expected

These are my coordinates to draw the scatter plot

[{ "y": 83.0, "x": 0.0 },
{ "y": 73.0, "x": 15.0 },
{ "y": 63.0, "x": 30.0 }.....]

my x axis is incrementing with 15 points. 0,15,30,45,50...

If I do not use IndexAxisValueFormatter, it draws

Where as If I use IndexAxisValueFormatter with the values [0,15,30...]. It draws xAxis wrongly

I'm using following chart properties. My chart is scrollable

chartView.setVisibleXRangeMinimum(3)
chartView.setVisibleXRangeMaximum(200
chartView.setScaleEnabled(false)
chartView.dragEnabled = true
chartView.scaleXEnabled = false
chartView.pinchZoomEnabled = false

//X axis
let xAxis = chartView.xAxis
xAxis.drawGridLinesEnabled = false
xAxis.drawLabelsEnabled = true
xAxis.labelPosition = .bottom

xAxis.granularity = 15

I'm suppose to change this 15, 30, 45 to Date format "hh:mm a" based on the first timestamp. I guess if the IndexAxisValueFormatter draws it correctly, date formatted string will also be correct. Please let me know what went wrong

## What did you do?

ℹ Please replace this with what you did.

## What did you expect to happen?

ℹ Please replace this with what you expected to happen.

## What happened instead?

ℹ Please replace this with of what happened instead.

## DGCharts Environment

**DGCharts version/Branch/Commit Number:**
**Xcode version:**
**Swift version:**
**Platform(s) running DGCharts:**
**macOS version running Xcode:**

## Demo Project

ℹ Please link to or upload a project we can download that reproduces the issue.

Start by reproducing the scatter plot with IndexAxisValueFormatter, xAxis.granularity set to 15, and the visible-range and scrolling settings shown in the issue. Compare the formatter and axis-label behavior with and without it; done means the 0, 15, 30, and subsequent labels align with the plotted x-values and can support the requested date formatting.

Written by the indexing model from the issue text.