@Christopher64 - both the screenshots you've posted are the same?
I'm not sure I completely understand what you are experiencing, so not sure if I am able to really help
However I know that you are taken through a series of pages where you will see more info, before you actually have to commit to paying. I also know that house rules can sometimes contain extra charges which the host can impose after the booking is finalised - eg Pet Fee, eco cleaning fee ( this is not all that common but possible, so be sure you read the listing AND the house rules carefully before you book or request to book anywhere
I THINK what you may partly be seeing is the difference between hosts who have instant book - where your booking is immediately confirmed once you've paid, and host who have REQUEST to book - where you need to interact with the host first who then decides whether or not you are a good match for each other.
Generally speaking though ( apart from the house rules element mentioned above) once you have selected a listing, entered the appropriate number of guests, the actual dates you are planning to stay - the price shown should be the actual total, and a breakdown is shown at some point - if not on the first page then on the second before you pay.
I'm not very experienced as a guest so I could have some details wrong.
Replying to this message though will bring this thread higher up so more hosts may see and respond and add further clarification.
Regards