In order for us to provide better support, we need to see the log generated by Citra. This guide will walk you through how you can obtain the log file: How to Upload the Log File.
The bot’s link has steps how to acquire it. You can also get to the folder by going (in Citra) File -> Open Citra Folder, it is inside the log folder.
The log gets cleared every time you open Citra so once you close Citra after you have seen the issue in game, immediately go and upload citra_log here.