I should have said “the last link to a stylesheet”. I generally put links to stylesheets last or next to last. Any JS in the head would follow them, everything else is above them. Someone with other experience may recommend a different order.
It looks to me like you have some work ahead to delete the unnecessary styles from your local stylesheet that are messing up the layout and to keep the ones that matter. It shouldn’t be difficult, but you should be methodical and careful… testing after each step. You will probably be able to delete most or all of those !important modifiers.
Yes, I know.
The local stylesheet should never have been at the top of the cascade.