UWP App flickers, if installed via Microsoft Store, but not, if installed in program folder

  

I transformed a 64bit-program, created with Delphi XE6 – FireMonkey, manually to the UWP and sent it to the Microsoft Store. When it was published, some users informed me, that all buttons in the app are flickering. I sent them the original 64bit-program and this was working fine on their machine. On my computer both app and program are working fine.
I noticed that the button of the callout-element on my machine looks different in app and program. In the app it has two checkmarks, in the program there is only one checkmark.
What can I do, to solve this problem?

This is my appxmanifest.xml:

<?xml version=”1.0″ encoding=”utf-8″?>
<Package xmlns=”http://schemas.microsoft.com/appx/manifest/foundation/windows10″
xmlns:uap=”http://schemas.microsoft.com/appx/manifest/uap/windows10″
xmlns:rescap=”http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities”>
<Identity Name=”…”
Version=”5.1.0.0″
ProcessorArchitecture = “x64″
Publisher=”…”/>
<Properties>
<DisplayName>…</DisplayName>
<PublisherDisplayName>…</PublisherDisplayName>
<Logo>images\small_icon.png</Logo>
</Properties>
<Resources>
<Resource Language=”de” />
</Resources>
<Dependencies>
<TargetDeviceFamily Name=”Windows.Desktop” MinVersion=”10.0.0.0″ MaxVersionTested=”10.0.17134.765″ />
</Dependencies>
<Capabilities>
<rescap:Capability Name=”runFullTrust”/>
</Capabilities>
<Applications>
<Application Id=”…” Executable=”….exe” EntryPoint=”Windows.FullTrustApplication”>
<uap:VisualElements DisplayName=”..” Description=”….”
Square150x150Logo=”images\icon.png” Square44x44Logo=”images\small_icon.png”
BackgroundColor=”#464646″ />
<Extensions>
<uap:Extension Category=”windows.fileTypeAssociation”>
<uap:FileTypeAssociation Name=”…”>
<uap:Logo>images\small_icon.png</uap:Logo>
<uap:SupportedFileTypes>
<uap:FileType>….</uap:FileType>
<uap:FileType>….</uap:FileType>
<uap:FileType>….</uap:FileType>
</uap:SupportedFileTypes>
</uap:FileTypeAssociation>
</uap:Extension>
</Extensions>
</Application>
</Applications>
</Package>

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