Text in certain columns/rows is hidden

I have created a class with 44 rows and 10 columns...so far. The last column should contain numerical scores for a mid term exam. However, in rows 36 through 30 the text is hidden although i can see it when i tap "edit student".

How can i fix this?

Hi yindee,
Would you mind sending us a backup at support@idoceo.net so that we can give it a look?
Thanks and happy new year

Thank you for your speedy reply. However, when I reopened the class in question, to make the back up to send you, all of the data showed up. So apparently the problem fixed itself.