Here is the formula used:
Filter(
'SOI Orders',
StartsWith(Title,txtFacilityName_1.Value) ,
StartsWith(LastName,txtLastname_1.Value),
StartsWith(City,txtCity_1.Value),
(IsBlank(ddYearTerm_1.Selected.Value) || YearTerm = ddYearTerm_1.Selected.Value),
(IsBlank(ddFacilityType_1.Selected.Value) || TypeOfSchool.Value = ddFacilityType_1.Selected.Value),
(IsBlank(ddProvince_1.Selected.Value) || Province = (ddProvince_1.Selected.Value)),
(ddNotFilled_1.Selected.Value || DateRequestFilled=Blank())
)
This pic is production:

And this pic is in Canvas studio:

I don't understand why the production fails like this. There is no error shown.
Can someone think of what I have done wrong?
Thanks for your help.