Website erratic on iPhones
Hello
I've posted a couple of times before but perhaps never properly introduced myself. By the way it's not a current pic of me, I'm sadly way older than that, still missing my youth;)
I'm trying to learn HTML and CSS but finding it a slow process. I've completed a very basic course and have been plowing through the W3Schools and adobe tutorials and while I'm getting a better understanding of the theory, practise is very much a different matter. I'm currently using the latest version of Dreamweaver. I only wish to attain skills for my own personal use, I have no intention of trying to set myself up in any shape or form as a web designer.
I've currently copied and pasted a w3schools template (am I allowed to say that, there weren't any appropriate free adobe ones) into my Dreamweaver application to get some practise and adapted it to suit my needs.
I've uploaded it to a remote server and it appears to work fine on Desktop and iPad but is erratic on iPhones, I have an iPhone 6s but I've tried it on other models and it's the same issue on them all.
It loads and resizes perfectly to fit the screen and initially it'll work for a bit but if I open and close the images repeatedly they eventually start to overlap, this happens on all the pages.
The only errors that appear on my HTML sheet are below

and the only errors on my CSS sheet are below

Would these errors be likely to cause the overlapping of images, see below, on mobile devices?


My web address: martinvallis.com
Any thoughts and feedback would be much appreciated.
Thanks in anticipation.
Martin
