Nova Trend Metric, number is divided by 1000

Hi,

I'm trying using Laraval Nova Trend Metric, but the output is wrong. Do you guys know why I get numbers like this 0.90k, 0.80k, 0.70k instead of 900, 800, 700 ?

Database screenshots here: https://imgur.com/a/Xk9qPbq

Nothing fancy added at all in my application.

Have tried to delete everything a few times, but the result always end up the same and I have absolutely no idea what is causing it :(

What can cause this problem? Any help is very much appreciated.

<?php

namespace App\Nova\Metrics;

use App\Models\Purchase;
use Laravel\Nova\Http\Requests\NovaRequest;
use Laravel\Nova\Metrics\Trend;

class PurchasesPerDay extends Trend
{
    /**
     * Calculate the value of the metric.
     *
     * @param  \Laravel\Nova\Http\Requests\NovaRequest  $request
     * @return mixed
     */
    public function calculate(NovaRequest $request)
    {
        return $this->sumByDays($request, Purchase::class, 'amount');
    }

    /**
     * Get the ranges available for the metric.
     *
     * @return array
     */
    public function ranges()
    {
        return [
            30 => __('30 Days'),
            60 => __('60 Days'),
            90 => __('90 Days'),
        ];
    }

    /**
     * Determine for how many minutes the metric should be cached.
     *
     * @return  \DateTimeInterface|\DateInterval|float|int
     */
    public function cacheFor()
    {
        // return now()->addMinutes(5);
    }

    /**
     * Get the URI key for the metric.
     *
     * @return string
     */
    public function uriKey()
    {
        return 'purchases-per-day';
    }
}