First thing, those forums are in English, please post in English.
If you don't know English very well, you can check the unofficial French-speaking forums (http://forum.construct-french.fr/
Secondly, we can't guess what is going on from a video from the preview, so please consider providing your capx file for others to be able to investigate.
Moreover do provide an explanation of what you are trying to achieve, what you have done so far, what you expect your code to do, what you experience it does (the video does help out, but a bit of clearer/detailed explanation is always appreciated).
Do provide steps to reproduce the issue out of the project your provide.
Without this, there is no way to help out as we don't know how you implemented things.