In Ukrainian, after a vowel use "в" not "у". After a consonant you should use "у." DL is inconsistent in this use.
It says this rule is not strictly followed by native speakers, so I am also confused about it.
Here is a write-up. I know that Vinnfred also did one about a month ago, but I can't find it and DL does not have search capability on discussions (at least that I have found).
Thanks for the link. So in this case it would be "в" because of the rule "after a vowel before a word beginning one consonant"?
I believe that is correct.
These two posts may also be of interest to you.
I am also wondering why "На" is not accepted.
"на" would mean that food is on top of the fridge