Adding a row, adding samples always mapped to C1

Hi -

When adding a row to a cell matrix, then adding samples to cells in that new row, the range always comes up as C1-C1 and not the next unused note, so when I play that new sample it plays that sample as well as the first sample in the matrix as well as any others I've added to that new row. So I have to manually change the range for each sample. Any ideas here? Thx in advance.