the modal group is the group with most data in.
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They are both modal classes - the distribution is bi-modal.
It is simply a distribution which has two modal classes: you cannot convert two of them into a mode.
It is often claimed that height is bi-modal because there will be one modal height for men and one for women. But unless there are exactly the same number of men and of women in the modal class, both cannot be modes. Consequently, this attribute really has only one mode. The same applies to other characteristics.
When observations are grouped into class intervals, the interval that contains the most frequently occurring value is known as the modal class.
The distribution is bimodal. That is all there is to it.