Why is the image distorted when I try to make it bigger?
I found the problem.
The solution was in this Forum (I attach the solution)
"This may be due the ‘9-slice’ setting on the buttons. The 9-slice allows to have resolution independent rounded corners on the buttons, but depending on source image it may distort the result. Try disabling the 9-slice option for your buttons:
Edit mode, select button
Go to Look’n Feel->Special->Button
Adjust ‘9 Slice Edge Size’ to 0%"
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