Map issue

[Fevix]

[18:35] mapfile warning: segment-offset mismatch for grid 1fb2578a324e948a in segment ea5b6f5b2d42505: segment has (-1399, -1412), gridinfo has (-19, -32) 
[18:35] mapfile warning: segment-offset mismatch for grid 130fdb0a65e915c0 in segment ea5b6f5b2d42505: segment has (-1398, -1411), gridinfo has (-18, -31) 
[18:35] mapfile warning: segment-offset mismatch for grid c98cca7f3fe91520 in segment ea5b6f5b2d42505: segment has (-1399, -1410), gridinfo has (-19, -30) 
[18:35] mapfile warning: segment-offset mismatch for grid 129aed79984c5b4b in segment ea5b6f5b2d42505: segment has (-1400, -1411), gridinfo has (-20, -31) 
[18:35] mapfile warning: segment-offset mismatch for grid 7e1a66570fa2aba9 in segment ea5b6f5b2d42505: segment has (-1398, -1412), gridinfo has (-18, -32) 
[18:35] mapfile warning: segment-offset mismatch for grid d52e4fcfeaf26bcf in segment ea5b6f5b2d42505: segment has (-1398, -1410), gridinfo has (-18, -30) 
[18:35] mapfile warning: segment-offset mismatch for grid b9d9ca9d46e93f0f in segment ea5b6f5b2d42505: segment has (-1400, -1410), gridinfo has (-20, -30) 
[18:35] mapfile warning: segment-offset mismatch for grid 4dc03c6782e28187 in segment ea5b6f5b2d42505: segment has (-1400, -1412), gridinfo has (-20, -32)

Happened a long while ago, and the same lines come every time the game is launched.

Is not happening to my client, is happening to my mother's.

Of possible note is that she did NOT have "save map tiles to disk" during her first few play sessions when this started happening, but enabled it a while after.