Vector arrows over flow velocity map in QGIS

I have a point layer with X, Y, Vel and VelA parameters where Vel stands for the magnitude of flow velocity and the VelA is a rotation of the arrows so the arrow is pointing on the dominant direction of flow in given area. This point layer is above a raster layer which shows the velocities at color range.

When I go to Layer styling of the point layer and select Size to be the Vel and Rotation to be the VelA the result is somewhat strange – see attached picture. The very same picture is in every point of the point layer – for ilustration I am attaching a larger cut from the map where the points arranged in grid can be seen. When I zoom to the specific one point I see the situation on the second picture.

My aim is to have a single point on map represented by the arrow which size and rotation is given by the attributes.

Any ideas where the problem might be?