Hello,
1/ Changing the title of tab works as it should ( https://prnt.sc/Uk2AJfsxSV2l -> https://prnt.sc/Gf5oj5aT62yx )
2/ Login to wp dashboard does not work -> https://prnt.sc/GQHX7ZafGYDj
3/ Previously we made changes in xstore-child/woocommerce/single-product/tabs/tabs.php to make positions of custom tabs changed (moved above others) – but we could not check because
3.1/ we cannot find product with custom tabs
3.2/ edit any product is not possible due to the limited access of admin user you provided.
Could you please, write what questions do you still have and provide link for product with custom tabs to check their positions (if the fix does not work still)?
Regards