Can't buy bonus skill 'idiom' in store

[KindredCain]

I earned three bonus skill slots yesterday then I found two skills in store. I figure out I really like 'idiom' but its cost is 30 lingots which exceeds my account so I decided to save up for it. However, when checked my goal earlier I only find that its price is gone and I can't buy it anymore. Does anybody know the reason? What can I do for it?

[louis.vang]

Probably it is temporarely. I have checked it and the bonu skills are on the right place for the languages wich have rhem.

[KindredCain]

I have no clue. It's still not available. Sad... There is no price at all. But thanks anyway.

[territrades]

The most common solution for all kinds of bugs on Duolingo is just to reload the entire page (by pressing F5). Helped me many times.

[KindredCain]

Tried, didn't work. But THX! :-)