Created attachment 91944 [details]
Test case

Compare the colors of the shape contained in the attached document when you open it with MS Office and LibreOffice: the order of the first and second colors is swapped.

Check the OOXML definition of the gradient with the definition of a document exported from LibO:

Original document, see how the second and the third colors are equal:
<a:gradFill>
  <a:gsLst>
    <a:gs pos="0">
      <a:schemeClr val="accent5"/>
    </a:gs>
    <a:gs pos="50000">
      <a:schemeClr val="accent1">
        <a:tint val="44500"/>
        <a:satMod val="160000"/>
      </a:schemeClr>
    </a:gs>
    <a:gs pos="100000">
      <a:schemeClr val="accent1"/>
    </a:gs>
  </a:gsLst>
  <a:lin ang="5400000" scaled="0"/>
</a:gradFill>

Exported document, see how the first and the third colors are equal now:
<a:gradFill>
  <a:gsLst>
    <a:gs pos="0">
      <a:srgbClr val="ff388c"/>
    </a:gs>
    <a:gs pos="50000">
      <a:srgbClr val="005bd3"/>
    </a:gs>
    <a:gs pos="100000">
      <a:srgbClr val="ff388c"/>
    </a:gs>
  </a:gsLst>
  <a:lin ang="5400000"/>
</a:gradFill>