Under macOS 10.14.4, I've enabled the following dictionaries:
Yet, when I hid ⌃⌘D, I get the results as follows:
I would expect the results to show only American English dictionaries, and not British English.
This seems to be a bug that appears when you're switching languages. I know I had switched from British to American English at some point before.
What you have to do is:
Now the order is correct, and the British dictionary entries are gone from the results.