Number of learned words decreased - Website

I am uncertain if this is even a bug but, when I created Japanese courses in the Website, my learned words were decreased. I had approximately 1340 words learned and when I saved my progress in the created course, my total learned words were 1046. Can anyone please help me?

By the way, I’m not sure if this the correct forum section. If it’s not, please be so kind as to send me the right one in the comments.

Thank you in advance.