Blueprint Map Can't Find Exist Element

Hi there
I have 8 elements in my map. My map is String to ButtonStyle, the key type is String ,value type is ButtonStyle. I added 8 members into my map which is called NBSQianLi.


I am pretty sure that my element is correct. However, when I wanna to find its value by key, I can’t find any of it except the first element. It is so strange, does anyone meet the same problem yet?

Here is my image:

As you can see, the return value is false. But why the NBSQianLi variable has a [""] key? That’s impossible. Cause I didn’t set any empty key!

Any idea could be helpful. Thank you!

I am having the same problem, Did you find a resolution?
I am using 4.21.2