我找到了问题所在。我希望不必求助于罗伯特的回答，尽管我很高兴确认它会起作用!Duopixel的答案实际上是最接近的，尽管事实证明还有其他原因。

When you're working with different paths in Inkscape documents, I believe its default behaviour is to group them together under an <svg:g.../> tag. When modifying paths in a group, Inkscape will automatically add a transform to the group to represent these changes. However, if you open the XML editor and drag your path outside the <svg:g.../> tag and make it its own <svg:path.../> tag, Inkscape is free to edit the individual points at will. In the end it did turn out to be a grouping problem even though I was only working with one path! Hope this helps others in similar situations.

对于团队来说，重组可以很快完成任务。选择组，按Ctrl+Shift+G(去组)，然后按Ctrl+G(组)。

对于一些有类似问题的对象，例如螺旋线和星形，快速的方法是按Ctrl+Alt+C(描边到路径)-然而，这将对象转换为纯路径，并删除所有额外的属性，如sodipodi:cx, sodipodi:revolutions等等。

选择有问题的元素 对象>取消分组(重复直到所有内容都取消分组;参见嵌套节点的XML编辑器) 对象到路径(将多边形转换为路径) 对象>变换>取消相对移动>应用

I tried the solution posted here, namely to remove the group tags in the SVG-file and reopen it in Inkscape (0.48.3.1 in my case). Alas, after I translated the paths again using the select and transform mode (F1) and saved it, the group tags reappeared! Inkscape saves all transformations applied to the path in a surrounding group element. Unless you use the path-node selection tool (F2), hit ctrl+a and move the nodes of the path to their right place. After I had done this instead and saved afterwards Inkscape didn't add the group tags, because this translation applied directly to the path model. Hope this helps.

Inkscape可以清除转换数据，但仍然保留对象的值不被修改。

在Inkscape中，选择对象和“路径”菜单，“简化”。 现在，您将删除转换。

如果有人在草图3中找到解决方案，选择该图层，然后单击图层->路径->Flatten。