That happened to me also. It is because myfico only alerts on certain things. So your scores are always moving around. When you have a hardpull that is a alert and you will see all the movement that had happened that did not cause an alert. I hope that made since. I don't think that I explained it as well as it was explained to me 
Not a bad explanation. The main thing is, look past the initial indicator to see what else has been going on in the file for the past month or more. These alerts are not showing all the changes in the credit report, only certain types of changes, and you don't see the same exact changes leading to alerts on all three bureaus at the same time, because each bureau has it's own alert trigger, so you have to combine the information, and add in whatever else you know about such things as baddies falling off, or aging of accounts reaching certain thresholds that give the score a boost.
Makes sense........the inquiry was worth it since Macy's hiked me from 100-500 
You gave up a HP for a $400 increase in a CL?
Suggestion: perhaps lurking and reading up on where CLI are SP, or how to get CLI in ways without a HP would be good And asking if uncertain, others have undoubtedly got some experience.
If you started at $100 on a Macy's card, what is your overall credit profile? What are your MyFICO scores, which cards and limits do you have? When were the cards opened?