PDF ViewSDK: Field changes not saved after scrolling

We are using the PDF Viewer SDK in our own web app and came across a tricky problem: It happens that sometimes input of a user in PDF fields are missing. For instance: When a user klicks a ckeck-Box, scrolls upward or downward (on a tablet by tab&drag) and then klicks a button to store the document, the value of the check-box shows "not checked" while the check-box itself in the form appears as "checked".

We figured out that this problem only appears on tablets (iPads or Androids, different browsers), when the user scrolls (tab&drag) right after an input in a field. It does NOT happen, when the user tabs anywhere in the form before scrolling and signing.

Has anyone an idea how to fix this problem?