OneDrive - Forms fields turn gray after edited in OneDrive

I have made an form in Adobe Acrobat DC to fill out on ipad with signature fields. 

The editable fields are blank when I put it in OneDrive. 

When opened in Onedrive on iPad and some fields are filled and the form is signed, the following happens:

1. All editable fields turns gray and stays gray when printed. 

2. The signature field also turn gray and stays on top of the signature made on the iPad. 

Is there any possible way to avoid this? 

Due to company restrictions we are not allowed to install the Acrobat app on the iPad. 

Best regards

Morten Veum Apelthun