When we want to select an image on custom repeatable media field in front-end the Joomla Media Manager is showing instead of the JCE Media Manager.
When we use the Protostrar template there is no issue at all. See video below.
https://lumiga.nl/1/2021-12-15_16-29-51.mp4
This issue is only related to the repeatable media field.
When we want to select an image for the intro article or full article there is no issue at all as you can see in the video.
Kind regards,
Lumiga
JCE version: 2.9.18
maybe it's also related to this issue: https://www.joomlacontenteditor.net/support/forum/97483