When I export the otf, its preview doesn’t display the figures but just the standard alphabet. Is it a glyphs export problem? Thanks!
You mean the QuickView when you press the spacebar? That is handled by the system, and due to caching, not very reliable if the font changed. So I don’t recommend to use QuickView for testing your font.
Better use a web browser or the TextPreview app (see the Tools section). Just make sure You circumvent the macOS font cache problem. Read this please:
The missing numbers is not an issue with the font.