When I create custom workspace and want to make new object, and when I type dimensions in the dialog box, Illustrator breaks dimensions, e.g. 250 mm becomes 250.5 or 250.06 or 249.999 or else. This also happens when I open previously created documents with exact dimensions, e.g its dimensions become broken.

Note that this is happening only with custom workspaces created, and the problem persists even if I switch back to the default workspace. The only working solution is reinstalling Illustrator and working under any of the default workspaces, which is driving me nuts. Please fix it.

MacOS Mojave 10.14.6