I have tried everything even create a new collection.
I am trying to "Sort by--> Lowest Price" and although it is checked and seems fine, however and whatever I do, in my store products are shown in alphabetical order again!
I have cleared cache, created a new collection, select the products manually to put on top the lowest priced one and even then they are still shown in alphabetical order.
Can we see a link to that collection please?
And when you talk about sorting, is that via the Admin or via the Theme UI. Both have sorting options but it’s not clear what one you might be talking about.