Old imported lessons not visible anymore

During my Turkish studies on LingQ, I’ve created a course “Assimil” and imported a couple of lessons privately. Everything worked as expected until a few weeks ago. If I go to the course now, it indicates the number of imported lessons (38), but only contains the last of them (65 Kapadokya’ya giderken). What can I do to recover the remaining lessons?

Can you please send a link of that course to support (at) lingq.com? Thanks!