Email is sent with an old version of a template

Hi Courier team!

We have an issue sending emails using templates
Sometimes the emails use the actual template design, but sometimes they use the old version of the same template, the one we used long time ago.
Template ID and the data structure we send to the API endpoint are always the same, the only change we made recently are the translations.

Do you know why it is happening and how it can be fixed?
Thank you