This is an issue with the latest upgrade of InDesign. Let Adone know how you feel about it here: Feature Request/Bug Report Form .
And in the meantime, the workarounds are:
1. Roll back to the previous version or
2. Edit the text field names in Acrobat.
additional threads on this topic:
Workarround 2 is not an option for me, as it on the form too many regularly are unfortunately changes in the text. Every time adapt all fields in Acrobat - it costs too much time. That's why I use again a older version of InDesign.
I hear you.
The next upgrade is due out soon. It might be worth taking another look after the release, because this has been an issue for a lot of people.