Do you have an issue where you can't refresh your exercise, or you can't go to the next exercise in a package?
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It could be that you can't go to the next exercise because:
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The exercise is in a set, and you have to complete the first exercise before going to the next one.
If the exercises are connected with a white line, it means that they are in a set. In this case, you will have to first solve the first exercise before going to the next one.
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Your teacher chose a practice mode where it's only possible to do exercises one by one.
If the exercises aren't connected with the white line, it means that they aren't in a set or a package. If you can't click around and go to the later exercises before completing the first ones, it could be because your teacher chose those settings.