Weird behaviour or bug?

Hi,

I was creating new DNS static entries on 6.34.3 and I found something weird.
If I create a new static entry and disable, still appear on DNS Cache. If I delete the disabled entry, still on DNS Cache even after I delete and flush.
For remove the entry I have to add a new one and be sure that is enabled before remove.
It’s the usual behaviour? Can anyone test?

Thanks in advance.

Now is working, I guess that something went wrong and is working now.

I was testing and is happening again. This is a feature?
Added a image.
2016-03-16 (2).png