Can you please try Krita 5.0.0 beta1 - First Beta for Krita 5.0 released | Krita - and see if it fixes your issue? Some time ago I fixed a very big issue with isometric grids locations, and it seems like maybe 4.4.7 didn’t get that fix.
Note that if you want to check it out, you should first back up your configuration and resources. See here how to do it: Help Krita improve with structured Beta Testing of the new resource system in Krita 5.0
If it turns out that it works better, as I expect since I just checked it and the lines meet in the correct place and not in the middle of the pixel, please pay attention to any new beta version that comes out - it will be safer to keep up with development since there are still bugs there that needs to be fixed before a final release is made. Next beta should be next week. And make extra sure that you update to Krita 5.0 final whenever it comes up.
It would be also awesome if you report issues that you see, at least here on the forum, especially if Krita crashes. That means we’d know about it and we’ll have a chance to fix them if they have high enough priority (but even if not, they will go to the future todo list).
And make sure to be extra safe about saving your files.
(Also I just noticed that Krita 5.0 beta 1 can’t remember the spacing value 
That’s super annoying so I fixed it real quick, and the fix will be in the next beta version and in the next nightly; “next nightly” means: you need to wait ~26h from now, and then download Krita Next from the website).