Collapsing rows in table


I have vaadin 7 and I’m using Table.
The problem is that when adding more rows to the table (user can add rows dynamically), at some point all rows collapses and no rows are visible anymore.

For example, if pageLength is 10, then when user adds row 11 all the rows collapses and anything can not be seen. Adding one more, there might be rows 11 and 12 visible and all others are collapsed (or row height is 0 or 1).

How do I disable this functionality of the table?