The BCEA is very clear on when an expecting mother maternity leave:
2) An employee may commence maternity leave--
(a) at any time from four weeks before the expected date of birth, unless otherwise agreed; or
(b) on a date from which a medical practitioner or a midwife certifies that it is...
Your problem is a very common problem which most companies experience who does their submissions monthly on UFiling. Here is a few solutions that you can explore.
1, Submit all your declarations from March 2019 - To date.
2. Your blocks are remaining orange.
3. The possible reasons for this...