[Redmine BT] Drop-down list no longer below the field

Affected version : 9.0.0.0release and 10.0.0.it6

Steps to reproduce

• Associate a BT redmine and a project on the Squash project (Use the 'ATH Project' if required)
• Declare a new anomaly
• Click in the Priority field (for example, this applies to other fields)
• scroll page

Expected result

the options in the list remain stuck to the field

Observed behaviour

list options remain blocked