It may happen that your click does not result in a visible progress of the campaign. This is because the amount of product offered by your click is below the threshold required for the progress counter to be updated.
For example, a click that offers 2 grams of food will not always be enough to update the counter showing the amount of food collected in kg, or in number of cans of wet food.
However, rest assured that your click is properly credited to the campaign, and contributes to its progress.