SVG is both a working document format and an end user format.
It’s capable of keeping text as text and need the proper fonts on every system to render properly.
Depending on how you setup your graphic vector software, text isn’t outlined (vectorized) upon export to SVG. (I personally set Illustrator “Export for screens” feature to vectorize any text on export to avoid issues)
So in your case the G is a text G, not a vector G. Your first image shows your logo on your computer, which has the font to render it properly. Second image probably shows the image in another environment, like your mobile, which doesn’t have the font to render the G and defaults to another serif font: Georgia.
Manually vectorize the G in your graphic software before saving as SVG, or set the app to vectorize any text on export.