Do not add Space when adding tags - "Please use only 5 categories"

I just found out that you should not add a space in between the tags because space will act like a category. Here in the below picture even though I have added only 5 categories it will display a message saying that "Please use only 5 categories".

Guess what you failed to notice the space between steemit and photo. So next time when you receive this message check twice that have you added an extra space or not.

It will not allow you to add space on the first tag.