Open Roberta xNN - Pop-up Trainingsdata window on test-server

[Thorlogy]

Describe the bug
When you click on enter training data, the pop-up window for entering the data appears with a doubled heading line. the error disappears when you close and reopen the window or when you add or remove a line in the data set

To Reproduce
Steps to reproduce the behavior:

1. Go to 'xNN'
2. Click on 'enter trainings/test data'
3. See error

Expected behavior
only one heading line appears

Screenshots

Device information

• Type laptop
• OS: MacOS
• Browser chrome