ArcGis Online changes hatch rendering

[DeborahDAVID]

Hi,
I'm trying to publish from ArcGis Pro on ArcGis Online, some feature services with hatched symbology. I know that ArcGis Online does not support real hatches, so I've done an image (png) with hatches to do the symbology by image. On ArcGis Pro, the result is very good, but on ArcGis Online, the result is not acceptable. We see like a separation between images.

Here is the result on ArcGis Pro :

I don't know how to do. Can you help me ?

In attachment, there are my png image for hatches  and my png image for cross-hatches.