To fix this problem, you need to open your SVG icons file with some editor like Sublime Text or default system text editor and add height and width attributes to your <svg> tag like it is shown on the screenshot https://gyazo.com/83fd36b0bb9628bb1aed2bd3d5d063c5
Then you will need to reupload your icons in WordPress Dashboard.
Problem is still on. I cant fix this. Spacing still there.I edited like you said. But it cant fix this. You can see live there http://www.kaizenshop.org