Laravel eloquent Int greater then column but lest then other column

I have a weird problem and can't understand why it happens.

I have a table where row has start = 300 and end = 400.

When I try to filter:

     $price = 320;

     Price::where('start', '>=', $price)->where('end', '<=', $price)->first() 

And I have always an empty result. All columns set to an integer. '$price' is an integer. Why I get an empty result, have no idea...

via Chebli Mohamed