Hello,
It can be a conflict of the Customization done in your Child Theme which is causing that. So, you might need to reconsider the Customization(s) done in your Child Theme in this regard and then check back the concern again or you can simply try to backup or copy the customization in your current Child Theme and delete your current Child Theme and try creating a new one to confirm more.
Regarding updating the Theme concern, please try updating your Theme following the Theme Documentation guide defined here: https://xtemos.com/docs-topic/update-the-theme/
Best Regards
.
