Entity Grid is automatically added to Table Layout

Hi there,

i have created a background for our tables.

I followed this Tutorial:

https://www.youtube.com/watch?v=wTF3lQCVhNE

But when i am finished with the entity buttons and i have left the design mode, the program is adding three whole entity grids to the background.

I will attache some pictures, so you can see it.

I don't understand why it's doing it.

I hope you could help me!

Greats,

Michael