coordinates export

When I'm exporting coordinates of points to txt sometimes the exported coordinates are little moved... E.g. points: 407, 408 and 83.

nr  |               exported                   |             microstation              |   dx     |    dy   |
21 |  5689626.50  6421073.03  |  5689626.50  6421073.03 |  0.00  |  0.00 |
22 |  5689622.54  6421069.05  |  5689623.16  6421069.30 |  0.62  |  0.25 |
23 |  5689620.36  6421064.38  |  5689620.73  6421064.42 |  0.37  |  0.04 |
24 |  5689621.94  6421061.48  |  5689622.31  6421061.52 |  0.37  |  0.04 |

I don't understand why it is like that because I always use the same way (XYZ Text).

If somebody can help I would be grateful:) and sorry for my english;)