If you are using WC 3.0 then you need to update theme to version 3.11. Do this and check if it fixes your problem.
Also, I would not recommend you to update plugins if they release the major update if you are not sure that your theme and additional plugins are compatible with this new update.
Price showing problem is solved now,
but i’m getting this message
“Your theme (XStore Child) contains outdated copies of some WooCommerce template files. These files may need updating to ensure they are compatible with the current version of WooCommerce. You can see which files are affected from the system status page. If in doubt, check with the author of the theme.