Text in the logo doesn't appear at the IOS (iPhone). What is cause?
Image: SVG logo
Seems to be the lack of the correct font on the system that is causing it to disappear.
Converting the text in the svg to shapes worked for me: this is the logo that I converted to test with. I tested it by using Charles Proxy and mapping locally the image request to your current logo.
Hopefully you can use this updated logo.