When I export my shapefile to a personal geodatabase using ArcMap, the result is not the same as the original database. I do not know how to solve this problem.
It is possible that there is something wrong with resolution and tolerance in PGDB.
Take a look at sections X,y resolution and X,y tolerance in this topic.
Try increasing these values.
What coordinate system are you using? What values are set for resolution and tolerance?
It looks like you may be having an issue with the resolution setting of your Feature Dataset. Since you are using a Feature Dataset, you need to set an appropriate XY Tolerance, as mentioned in step 7 of the article "Creating a feature dataset". By default the XY tolerance should be sufficient (and in the case of WGS84, the resolution units are degrees). As this article states:
If needed, though, try reducing the XY Tolerance to meet your needs. The last panel of the wizard allows you to set the XY, Z, and M tolerance.