Yes.
Please look through the other threads on the forum such as here and here where other people have reported similar things. It may also help to try a different browser, try a new incognito browser, turn off all plugins, try a different computer and a different network.
It is likely that you will need to discuss the problem with the people who develop “Lizmap”, whatever that is. You could also consider:
- Try a different source of tiles. Whether this will work for you will depend on where you are, where you want raster tiles of, and what detail you want in them
- Create your own tiles and point at those.