Solve Special price problem Magento and standard price configuration for luma theme

We have a Magento 2.3 multishop, with two brand [login to view URL] and [login to view URL], in a cloudways Linode server and we use cloudflare, we have some problem with the setup or configuration and need to solve some issues, we need to all the work be done under stagging mode, to check everything is ok, before going live: 1 We created econosillas site changing the code of prices shown, to discount tax to price shown (Price/1.19), but I need to get back standar luma theme price, same like [login to view URL] site. Also in the checkout the total amount of the cart code was change adding*1,19 to shipping method, so we need to get back to original, not adding 1,19 to shipping price in both sites. 2 Special prices start and end date are changing without doing nothing, we put end date 30-05-2020 and after a few days or week you check the item and have end date 30-05-2029. 3 Some emails order are not arriving to the customer, others are taking too long, same when you whant to recover the password, we are ussing google gmail acount with our domain name, form and econosillas. 3 Special price in configurated product, are not showing the discount and normal price in the category page and also product page. Also need to be shown normal price and special price in both sites, and in category page and product page. 4 In the product page the magnifying glass is not working properly, so you could not see images details. If you have any question , please contact me.