Form Doesn't Always Update When Opened. Is This A Requery Problem?

Please refer to the attached file. The form of concern is frmAssessmentInput.

Select the appropriate criteria per instructions (in red), including entries on the continuous subform. Then click the "Input data" command button. A 2nd form opens (frmObservations) that contains a textbox labeled DocumentStreamID, and this textbox SHOULD contain the value from the corresponding DocumentStreamID textbox contained in the master form, where you clicked the command button. However, even though the sources are linked properly, the value doesn't pass if you click the command button immediately after adding a new record to the continuous form; it only passes if 1) the master form is closed and reopened first, or 2) if you close the 2nd form, toggle to design view and back to form view for the master form, and then click the "Input data" button again.

What is going on here? Given that the value passes once another procedure is run, do you think this a requery problem? I tried placing a VBA control requery in the 2nd form's On Current and On Load events, but this didn't solve things for me so I took out those event procedures (code could have been wrong though).