Blood pressure update broken on Web app

Adding blood pressure as a new biometric entry works fine, as does copying a bunch of biometrics and updating any of them other than blood pressure. When attempting to update the blood-pressure entry, the web app just presents two blank boxes with no cursor and no view of the existing values in the systolic and diastolic box. Hitting backspace and delete multiple times seems to clear out the box and permit entry, but it'd be nice to be able to see what we're doing.

Screenshot of existing update dialog, where the existing values are 121 for systolic and 74 for diastolic: