Because I need to switch to a new iMac, I downloaded svg files from IcoMoon off the old laptop and imported to the new iMac. All icons shifted to the bottom left corner. And I have to manually move each icon back to center.
And just now, I found out that the name of the icons is messed up. I am the only one have access to it. Some of the icon names are certainly being changed. ie it was 2.0_fish, and it is now 20_fish.