winddeployqt copies wrong MinGW compiler runtime when found in PATH

I have Qt installed here (path to libraries): c:\programs\Qt\5.7\mingw53_32\bin

And I also have Perl installed here: C:\programs\perl\c\bin. This path contains the following libraries as well:

• libstdc++-6.dll
• libwinpthread-1.dll

So, when I execute windeployqt, it copies libstdc++-6.dll and libwinpthread-1.dll from C:\programs\perl\c\bin, but not from the c:\programs\Qt\5.7\mingw53_32\bin. And those libraries are different, so my application won't launch, until I copy them from c:\programs\Qt\5.7\mingw53_32\bin.

I would assume, that windeployqt searches for libraries in every folder on the disk (going through the list alphabetically), and when it finds them in any folder, it stops the search. But that sounds like an incorrect behavior, doesn't it?

I have C:\programs\perl\c\bin in my PATH variable.