Repeating Group - Zoom out changes number of columns

Hi All,

I have Repeating Group with a Group of different types of elements in it. Group is for 15 pixels smaller than the cell, on both sides. RP has 4 columns, but when I zoom out to very small page, 4th column is removed below and RP has only 3 columns now.
Please for advice how to organize this well.

Thanks
Stevan