Coordinates are 354 instead of -6

[TaseraqFilemonsen]

Hi my data is in WG84 EPSG:4326

most of my data is in  lets say -6 but some are in positive 354

the data is drawn correctly on the display.

But I can't select negative data with the positive data.

Is there a way to recalculate the position of the positive data, so that they become negative?

my question might be vague, since I don't really understand the issue myself.

[RobertBorchert]

Can you be more specific as to what is -6 and what is 354 

It could be an issue with your original data source.

If you can, export the data to a shape file. 

Then add it back in using a different name to see if this clears it up.