I am having a problem with a WebView app that I am working on.
We have this responsive website that is being displayed through an android WebView
I'm fairly certain it's this same issue. Essentially it opens in another window and WebView doesn't support multiple windows out-of-the-box.
Luckily for you, unlike that question which was iOS-specific, if I recall correctly, it's possible to extend WebView to support multiple windows. You'll need to extend WebChromeClient, implement onCreateWindow and use it in your WebView.