It means that either that double checking showed all is ok or that whatever caused questionable levels have resolved.
How do you feel? Do you feel better after whatever preceded your needing blood tests being taken?
I've had to go back several times after infection, before the results were satisfactory. They are checking that results are not worsening or indicating the need for further investigation or treatment.
The question of whether you take HRT is up to you and maybe needs more thought and discussion with your GP. You can ask questions here as well. Some members of the forum are knowledgable and of browse through all the information on the website.
I think sometimes medics forget that us lay people do not share their expertise and do not explain. It's up to us to ask why, I'm afraid. If you go back to discuss HRT, you can ask.