Form Select is displaying itself broken full screen on Linux

[vaetas]

Hello, I've been trying to use form select in a WebView for Linux. Unfortunately the select/dropdown doesn't work as expected. It opens itself only on every second click. When the select is opened, it is maximized to whole screen with its dimensions deformed. (Resizing the window will resize the select dimensions too.)

Is there are any way to fix the window dimensions for form selects? I would assume that it's something to do with Chromium configuration but I'm kinda lost there. Would you be able to point me into the right direction or help me fix this? Thanks!

The webpage is here: html select form on w3schools

form-select-issue.webm