Ok that’s something normal, files are being downloaded again and the code changes.
What should I do if I don’t want some changes to take place?
For example a gallery plugin I use recently updated and a border I didn’t want to appear in the gallery now exists again.
Updates should always take place for security reasons but how should I override such behavior? Is there a way I can have another file that doesn’t allow for example that border effect to take place ?
Maybe with jQuery somehow ?
If it’s just a CSS change, load your own CSS stylesheet to override their CSS. If it’s the HTML of the plugin, then you will need to look at filter hooks to see what you can change. Some plugins are developer friendly and supply some filter hooks allowing you to change various things the plugin does; for others, you will need to get creative.