Create a WordPress Template

I have a working Wordpress custom template on my site, and the WooCommerce Shop, almost everything is fine as I can receive the orders. But, I want to remove some smaller bugs from my site. Bug 1. I have a custom Wordpress website with WooCoommerce shop. Whenever someone orders on my site, the order goes through without a problem to my backend, but the client receives this notice next to the item in the cart: "Warning: unserialize() expects parameter 1 to be string, array given in /home/josipm22/public_html/[login to view URL] on line 223" €3.00 or on another purchase: Warning: unserialize() expects parameter 1 to be string, array given in /home/josipm22/public_html/[login to view URL] on line 223 €4.00 How to fix that? Bug 2. When someone buys anything in my webshop ( [login to view URL] ) the cart small icon in the upper right corner gets stuck with the bought items although the items are not anymore in the cart, for example: [login to view URL] (274 EUR in the upper right corner SHOULD NOT BE THERE BECAUSE THE CART IS EMPTY AFTER THE PURCHASE!) [login to view URL] (64 EUR in the upper right corner SHOULD NOT BE THERE BECAUSE THE CART IS EMPTY AFTER THE PURCHASE!) So, when you click on that icon of the cart, it says: "Your cart is currently empty." - which is correct, but the icon of cart still shows the item inside it after the purchase - which is not correct. How to fix this bug which does not refresh the cart icon after the purchase? Bug 3. Somehow I have a double copied website inside my host files. So, there are three wp-folders in my public_html file, and also a folder named [login to view URL] which has again three wp-folders inside it. My website uses some folders for the homepage and other pages, while it uses another folder to load Shop. So, when I edit the .htaccess file from current state as it is (now my Shop is working, but [login to view URL] loads on Error 404), to default Wordpress values: # BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteRule ^index\.php$ - [L] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /[login to view URL] [L] </IfModule> # END WordPress and when I delete double folders so only that I have once 3 wp-folders inside my public_html file, the Shop stops to work, but the 'double homepage loading Error 404 problem' disappears!' Again, when I have backup and my Shop is working, then my homepage loads to [login to view URL] - which is non-existing page ofc. Somehow, I have double site copied inside my host and I cant make just one to work properly. So, to recapitulate this bug: I have ‘double site problem’ which means that whenever some types in the link area correctly (exactly) [[login to view URL]] – they get as result: [login to view URL], and ofc, Page not loaded, 404 error. Now, I can enter my host data, delete the double site folders (wp-admin, wp-content, wp-includes, as somehow I have those copied folders inside) and edit .htaccess file into a default wordpress info inside and make the double link problem dissapear – resolved. BUT, then my Shop is totally messed up, all the categories are gone and all I can see is products under All products. I get some error that some data is missing/is corrupted and my Shop doesn’t work. Whenever I fixed the shop problem, I got this double site link problem back again, as I have it now. The best offer will work via Skype or TeamViewer through my computer