Layers who disappear partially

[thomas.santana]

Hello.

I'm working to make a map on Gimp, and it's a huge image (16535x7087).

All was fine, i worked a lot on it, and i recently saw that some layers start to disappear partially or completely ! Like, "Amsterdam" became "Amster", or some illustration are cut in half, or some are completely gone

However, i can see that the layers are still complete theorically bc i see the dotted lines who are around the complete size of the layer (and they are still wrote in the layers screen in bottom right of course)

More and more layers are like that as i restart the project to work on it.

So firstly i thinked it was a RAM problem (i have 8GB RAM, and it's written "11.9GB" in the bottom center of the project page), so i copied the project and reduced by two the size of the image (now it's written 2.9GB) BUT the layers are still like that

Also, i just saw that when i modify a text layer, i can like delete a letter and rewrite it, and the complete text appear. I tried to move the non-text layers but nothing changed for them.

Does anyone know this problem ? 

Sorry for the big text, and eventually for my english idk

Thanks !