Issue with textures loading

I have a world that I play on and it is one that I am really proud of doing since it is one of the first ones I am doing without cheats, and I started this on my phone and I decided to move it over to move it to my PC so I could play it on Windows 10 while my siblings played it with me on my phone.  The issue is when I ported it the textures didn't load and all that appears for some blocks is either purple or green squares.  I have tried messing around with the files inside of my folder attempting to see if something would work but nothing.  I am about to uninstall Minecraft and reinstall it to see if that works.  Also I have the issue of my shield does not show up while holding it,

Thank you for making a great game and for listening to the community about the bugs and just for letting us give feedback about what we want in the game!!!