Error with quantity

Hi!

When you choose your sizes, the minimum value has to be 6 if not you can’t put in the chart. Also, there are 2 sides where you can see your amount of products…
I let you a pic: https://gyazo.com/f0f46e88474ab61918d8a045153abd2f
As you can see in the photo, the default value is 6, and I can’t buy less than 6

I let you the page: https://camisetasmartorell.com/producto/camiseta-algodon-nino-personalizada/

Thanks,
Alberto