Not seen such issue. Let us knowWhich version of aem?Are you access author through dispatcher?Are you using any machine translation during live copy?

Sounds like a bug to me. Please file support request to investigate further.

If you are talking about aem standard then follow scott recommendation. If you are looking for  aem forms addons then follow  https://helpx.adobe.com/aem-forms/6/dynamically-populate-dropdowns.html

Sorry. it is conf folder & not config. <cq_home>/crx-quickstart/launchpad/conf/<path of config>

Might be browser cache issue or there is wrong file system entry exists. Using browser private window and verify. If still issue persist identify the wrong entry from [1] , remove it & restart the instance. [1]   <cq_home>/crx-quickstart/launchpad/config/<path of config>

DictImportExportServlet part of bundle [1] renders it[1]  http://host:port/system/console/bundles/com.day.cq.cq-i18n

Can you post the logs. Sounds like a bug please file a official support request. 

If you are not have any integration & not using cloud services then disable the ServicesStatisticsJob by "unbind" the configuration of the service with PID com.day.cq.wcm.webservicesupport.impl.statistics.ServicesStatisticsJobYou can reach the configuration directly at this URL.http://HOST:PORT/syst...

Sounds like when you upgraded to 5.5 [1] might not tested your application correctly.  Engage with official support channel so that your history of instance can be discussed to arrive for possible solution.[1]   https://helpx.adobe.com/experience-manager/kb/replication-privileges-missing-after-upgra...

File an official support request with below information*)   Is it cluster setup*)   Complete log files*)   Output of /system/console/bundles/.json