User behaviour prediction and analysis have become one of the most important approaches in the research of adaptive user interfaces (UI). Web personalisation, automatic UI adoption, recommender engines, flexible and responsive frameworks to user actions and user behaviour prediction provide alternative automatic solutions to enhance sophisticated user interfaces and serve as an alternative to conservative approaches in UI development. Nevertheless, research of unjust and improper user behaviour and its analysis in sophisticated user interfaces are left partly without needed attention. The objective of this paper is to focus on this kind of user behaviour and error analysis. In this paper we show that the rate of user mistakes while exploiting graphical UI depends on whether advanced UI development techniques like prototyping techniques and user tests were applied during UI development or they were disregarded. Moreover, the results demonstrate that graphical user interfaces without additional support for tablets and mobile devices have higher rate of user mistakes. For the latter, user tests were performed in order to analyse the importance and the scale of problem of clicking around UI elements. The paper also delivers solutions to user click misbehaviour problem to significantly decrease the rate of studied user interaction mistakes.