Answered: Numbers 1, 2, 3, 4 on my material?

Hi. I have created a smart material for my asset but when the material is added there are numbers 1, 2, 3 and 4 on the material. I don't know how this has happened and I don't know how to take them off.

If I go into layers and remove that layer then it removes the smart material also.

Can anyone help me out please