The tool follows line direction. Use Menu Processing > toolbox > Reverse line direction, then create the points, see: https://docs.qgis.org/latest/en/docs/user_manual/processing_algs/qgis/vectorgeometry.html#reverse-line-direction

The tool Points along Geometry follows line direction and thus begins where the line has the first vertex (start point). To start from the other end (the last vertex, end point), reverse the line direction:

Use Menu Processing > Toolbox > Reverse line direction, then create the points on the resulting line.