Forms not working in Acrobat version 21. 2.0. 17204

All Android devices running Acrobat version 2.0. 17204 fail to present checkbox ticks. However, on checking another Anroid device not connected to the Internet and running the previous version 

1. 10.1 16347 all forms worked perfectly. The forms were produced with Indesign and have been deployed for a number of years. I presume that there will be a fix for this temporary bug. Thanks Peter J