WKWebView doesn't decelerate scrolling (it just stops when I leave my finger)

Question

I'm trying to display an HTML page inside WKWebView, however, the scrolling doesn't decelerate when I scroll, it just stops:

The problem is not apparent when I try to scroll beyond the top bounds, but when I'm scrolling through the content, smooth scrolling/deceleration doesn't work. Sometimes, it can also act like the content is ending when I scroll down and hold, although the content continues at the bottom (it can be seen at some point at the video but here is a static image for clarification, look at the bottom of the screenshot):

I don't have any nested scroll views etc. There is just WKWebView inside my view controller (just ignore the overlapping behind the navigation bar, I'll style it later):

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    CGRect frame = self.view.bounds;
    frame.origin.y -= 64;
    frame.size.height += 64;
    WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
    webView = [[WKWebView alloc] initWithFrame:frame configuration:config];
    webView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [self.view addSubview:webView];
    [self reloadData]; //it just loads the static HTML page into the web view
}

What might cause this behavior and how can I prevent it?

Answer 1

I solved the problem: it wasn't related to the WKWebView itself. It was due to some script/styling inside that particular HTML file. I've taken the main (text, images etc.) parts to a clean HTML file and the problem went away.