Problem in redesigning one EAGLE schematic
This means that the schematic was designed with a different grid setting that the new one. Even if the grid size was the same it is possible that the origin has moved (if say you selected all and moved the group with the alt grid).

With a schematic, unlike the PCB, really everything should be on a strict grid, it is only Text Labels that should be allowed to be placed off grid (and even then I would still stick to the grid!).

For single wires you can ctrl+click on the end point of the wire to pull it back to the current grid. You can do the same with the origin points of components. However this only works if a very small number of bits are off grid. For a large schematic it would take a very long time to individually re-grid every component.

Fortunately, there is a quick solution to restore the entire schematic if it has ended up off-grid. In the schematic window, enter the following command:

run snap-on-grid-sch

What this will do is set the origin of every component and end points of every wire to be on grid. You can select the grid using that ULP, but I would advise sticking to the default grid of 100mil as most components will be designed that way.