Why do group transactions not retain transaction selections?

Nelson Spitnale

I have two group transactions that repeatedly lose the transactions I have selected. I create the group transaction, select the transactions I want to be included in the group. The group total is the correct total of the selected transactions until the next time I log in and then the two group totals are 0.00. I have other group transactions that retain the proper selected transactions. So I don;t understand why these two group tx keep losing the transactons selected.