Bugs can be easy to discover.
When a popup appears with an unreadable message in a programmatic dialect, for sure it's a bug.

But some may be more hidden.
You executed an action which costs resources but your resources wasn't updated in real time? This is at least an unwanted behavior we need to track.

We concisely write the rules and the game mechanisms to describe what should happen in different situations.

If you feel something weird is happening while you are using the website, take a look at these sections to be sure that this isn't how it should be, and then go to our bug tracker.
First, use the search bar succinctly describing your issue to see if it doesn't have already been reported. If not, create a ticket and describe the problem the more precisely possible to track down the bug.