Yale Romanisation Feedback

#1
I'm using Pleco flashcards to test my pronunciation using Cantonese Yale Romanisation.

I'm finding some strange issues with the Yale Romanisation. I'll list them here on this thread for your feedback.
 
#2

The Yale Romanisation is listed as ǹgh4 on the flash card. But when I enter ǹgh4 in the answer box it states it's incorrect. I need to enter ǹg4 to get the card scored as correct.

Strangely, in a list of flashcards (like in an Organize Cards list) the flashcard is listed as ǹghú. In the dictionary entry, the Yale Romanisation is listed as ǹgh±.

I think the correct romanisation is ǹgh4, but not sure why it's showing up differently in different places within the app.
 
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