Hello,
XStore 5.0 is major update and we have changed a lot of things https://xstore.8theme.com/update-history/ including theme styles. For example, we removed some headers types in 5 version of our theme, because they were very similar, and added new settings in Theme Options http://prntscr.com/lhpe2p
Child theme files should be updated according to new files.
Here you can find video How to update theme from 4.x to 5.x – https://youtu.be/I7wPeHEPb6E
To update the theme you can create a staging site (a full copy of live site) and update xstore there. Then, if everything is ok, update the production site.
Regards