Uploading website to live causing problems to plug-in and layout

you probably need to try:

  1. Cleaning browser cache
  2. Cleaning wordpress cache (https://www.wpbeginner.com/beginners-guide/how-to-clear-your-cache-in-wordpress/)

When you load the page for a first time and then updated code or content, you may need to enforce WordPress cache cleaning.
Also you can simply try switch to another theme and then back to your current theme.