The Freshlook Colourblend contact lenses slide very seriously in my eyes whenever I blink.
Contact lenses should move on blink or when you rotate your eye however this is a small movement and should not be noticeable.
If your lenses are moving around too much it may mean that it’s not suitable for the shape and curve of your eye. This will cause blurred vision and discomfort. I would advise that you stop wearing these lenses and arrange an appointment with your optician to find out if there are any other lenses that may be a better fit for you.