Magento 2 Price not updating in all store views when scope set to global

There is a problem in Magento that it doesn't take price scope into account while loading product EAV attributes. As a solution, you can tweak core code

MagentoEavModelResourceModelReadHandler::execute

Or remove obsolete data manually how is described below. Product price data is stored in catalog_product_entity_decimal MySQL table. You should delete all records for price attribute where store_id is not 0. Lookup price attribute ID by query:

SELECT `attribute`.`attribute_id` 
FROM `eav_attribute` AS `attribute` 
WHERE `attribute`.`attribute_code` = 'price' AND `attribute`.`entity_type_id` = (
    SELECT `entity_type`.`entity_type_id` FROM `eav_entity_type` AS `entity_type` WHERE `entity_type`.`entity_type_code` = 'catalog_product'
);

Price attribute ID equals to 77 in our case. Query to select obsolete price records

SELECT * FROM `catalog_product_entity_decimal` WHERE `store_id` <> 0 AND `attribute_id` = 77;

The result should be not empty in your case. To remove records run the query

DELETE FROM `catalog_product_entity_decimal` WHERE `store_id` <> 0 AND `attribute_id` = (SELECT `attribute`.`attribute_id` 
FROM `eav_attribute` AS `attribute` WHERE `attribute`.`attribute_code` = 'price' AND `attribute`.`entity_type_id` = (
    SELECT `entity_type`.`entity_type_id` FROM `eav_entity_type` AS `entity_type` WHERE `entity_type`.`entity_type_code` = 'catalog_product'
));

Finally, reindex data

php bin/magento indexer:reindex

Important Note! Backup your database before manipulations to be able to restore it if needed.