Current page error finiky

I opened a random .js file in a legacy project and every row except one threw an error.

Now, in the Problems view, which I have set to display only current selection, there are 0 items.

As you can see in my image, the first row is a comment, but there first error in the massive list, when I hover over the gutter icon, is "Expected an assignment or function call and instead saw an expression." The second one is "missing a semicolon" and so forth.

Now when I hit "Ctrl-S" for save, all but three disappear.

The comment's info is now "This character may get deleted by one or more browsers". Also, the Problems view is showing the correct 3 items.

Now this leads to me wonder if there is BOM in there. I opened the properties of the file and it says under Text file encoding, "Default (determined from content: UTF-8)" and "Byte Order Mark is UTF-8 (BOM)".

So I'm not positive, but I think the linter doesn't take into account files that contain BOM until it is saved, which I'm assuming Eclipse removes something it doesn't like.