Text disappear from field in created Interface

I've created process model by using appian designer and now work on interfaces which contains for example: form layout, user picker, department, description, city, date and other details.
It's kind of pop-up window where we are able to fill some text fields and after that we can send it/submit.
The issue is when one field is filled and i try to fill next one - when i do this the previous field dissapear.
Do you have any idea what can be wrong?

The goal for my work is to create process model to monitor some processes in company and to test some actions how they goes, in where part of process we can improve according to loosing time etc.

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