Why can I not see contributions/withdrawals/expenses/actions made before my next birthday?

This is because the forecasts in Goal start from next birthday, and therefore anything that takes place before next birthday is not included.

What this means for new clients being added is if the clients next birthday is say 06/06/2023 and an expense has been added for 21/05/2023 this will not be included in the forecasts or be displayed in the graph as it is prior to the next birthday start date.