Greetings! This issue has been fixed for some time now and we should have let you know before now, apologies.
Also, as of this latest release, the coordinate formats can now be changed back and forth from sexagesimal to decimal by clicking in the coordinates in the top left of ESASky.
on behalf of the ESASky team
This issue is fixed. Many thanks for reporting it and let us know if you still see any problems.
Dear Ming Yang,
We are working with the HST archive team to produce better HiPS (Hierarchical Progressive Survey) images - the background all sky images in ESASky (and the image above). We are also working on loading a fits onto the sky, in exactly the region that it falls compared with the background sky. This would also solve the above problem of seeing double images.
We'll announce when we have these ready.
Many thanks and regards,
Customer support service by UserEcho