Issues with rectangle backgrounds on online links

I have made some screens with Adobe XD, along with a prototype. 

On the local machine, everything works fine. 

I then create a link so that I can share it online. 

But I face an issue on the link, one of the rectangles (the one that represents the sidebar) has no background and thus, messes up my design. 

Here is the part of the design under adobe XD : 

And here is the result under the link : 

As you can see, the background is all "snowy" and see-through. 
I tried to delete the incriminating rectangle to recreate it, to no effect. I tried changing the background, the shadow, the border ... To no effect. 

I'm pretty new to XD so I do not know what is happening, could someone explain to me how to resolve that ? 

Thank you in advance.