Does this issue always happens or was it just one time? If it happens all the time could you send us a save file before engaging?
Do you have a save file of session that you experienced this issue? With your save file, we can reproduce the issue much easier and faster. You can find your save file here:C:\Users\username\Documents\Mount and Blade II Bannerlord\Game Saves
You can send your save files to us via the ticketing system on the website. To send us a ticket, please visit the www.taleworlds.com site and login to your forum account from the top right. Click to "My Account" and then click to "My Open Tickets". You can create a ticket there and include the save file and as well as the forum link of this thread. You can find more info about how to upload files to us with the new ticketing system here. Thanks for reporting and sorry for any inconvenience!