deck.gl: cannot get accurate position using meter offset in scatterplot

I used the below to plot using METER_OFFSET. Results are quite good until the points are very far from the Origin, where they start moving away from their positions plotted using LNGLAT. Any idea to get it more accurate with the lnglat positions?

class Layer extends ScatterplotLayer {
    constructor(props) {
        super(props)
    }

    calculateInstancePositions(attribute) {
        const { data, getPosition, projectionMode, positionOrigin } = this.props
        const { viewport } = this.context
        const { value } = attribute
        let i = 0
        for (const point of data) {
            let position = getPosition(point)
            if (projectionMode === COORDINATE_SYSTEM.METER_OFFSETS) {
                const lngLatDelta = [
                    position[0] - positionOrigin[0],
                    position[1] - positionOrigin[1]
                ]
                position = viewport.lngLatDeltaToMeters(lngLatDelta)
                if (
                    (lngLatDelta[0] < 0 && position[0] > 0) ||
                    (lngLatDelta[0] > 0 && position[0] < 0)
                ) {
                    position[0] *= -1
                }
                if (
                    (lngLatDelta[1] < 0 && position[1] < 0) ||
                    (lngLatDelta[1] > 0 && position[1] > 0)
                ) {
                    position[1] *= -1
                }
            }
            value[i++] = get(position, 0)
            value[i++] = get(position, 1)
            value[i++] = get(position, 2) || 0
        }
    }
}