Possibly happening because the fonts have been defined as HelveticaNeue-Bold, Helvetica Neue which are pre-installed on MacOS. It shows up in the default font on other OS's. Should add sans-serif here.
@Iniquity Please take note, that due to line-box rendering inconsistencies in SVG we can't fully control the vertical alignment of text in buttons without a massive manual extra step (moving all text items in SVG up by 1-2 pixels. This is a known issue and will be monitored. For now we have to continue with this small misalignment in SVG. Sketch and PNG are showing the correct position.
See https://iamvdo.me/en/blog/css-font-metrics-line-height-and-vertical-align for further information.