Two separate carts on my site

[beingwater]

I have started a ticket on this problem too but I thought I would try and get some feedback to see if anyone else is going through this and can give suggestions. Recently when I started adding some new products I noticed that the popup window wasn't working on the new items. I didn't think much of it as there were only a few on a not too visited page. Tonight I added four new items on a page that was already populated by a couple of products and I noticed that the new products opened in a full window and that they were in a separate cart from the cart in the popup window. The cart ID is the same but the re are two different carts that do not communicate with one another. This is very frustrating. I'm tempted to go through and eliminate all of the items and start from scratch and I will at least get everything in a single cart, but the popup will be gone.
I've tried removing the view cart and putting it back but that does nothing. In fact the items that show up in a popup seem to work whether or not the view cart button is on the page or not. Customers are getting confused and leaving.
Example page https://handywellpump.com/hand-well-pump-parts/

[E-junkie_Guru]

Take care to paste at least one complete copy of your View Cart code, copied directly from Seller Admin, into every page that has any number of Cart buttons. Your View Cart code is unique to you but the same for all your products, so it doesn't matter which product's button codes screen you copy it from. This code will add some javascript to your page that manages the overlay-style cart display within your page.

If the overlay-style cart cannot work for any reason in a given page, the Cart buttons on that page should still work in "fallback" mode by displaying the cart in a popup window/tab. However, items added to the overlay-style cart will not appear in the fallback/popup cart, nor vice-versa.