Modal meet very weird scene on Window system and the latest Chrome

Question:
I am using ng2-admin to build system for my company, and recently I met a very weird question on modal, because i develop under Mac, everything is fine, but on Windows, When I open modal, found a very weird white shadow on backdrop of modal, I don’t know what’s going on here, and whether it’s belong to a bug. See picture below.
shadow
version:

"ng-bootstrap": "^1.0.0-alpha.26",
"@angular/all": "4.1.3",

Chrome: 61.0.3163.100

Could anyone met this in before? Thanks for author build this great component.Could anyone help me? Thanks very much!

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