Campaigns will often naturally not perform great at the beginning. It is just a risk you have to take when creating them, so yes your %'s may drop to start with, but once you start optimising that campaign and its been running a while it should pick up and start converting as your other campaigns do providing you're doing everything right.
one day is absolutely nothing. CTR'S, conversion rates and all kinds of PPC metrics can fluctuate HUGELY between only a few days. You need to let a campaign run for weeks before you fully assess what's going on. Obviously you should look at the campaign regularly to see if any keywords are seriously under performing (ie. Lots of impressions, few clicks and therefore a shocking CTR) and pause/delete these where appropriate, but otherwise you need to give them time.
In order to avoid huge upsets to your other campaign metrics, start you new campaigns off with only Exact match keywords. Then as you see which keywords start to perform well, change those to Phrase match and keep moving up in this fashion as this allows you to identify which keywords will perform without destroying your accounts CTR and QS by immediately throwing out lots of broad match terms. This kind of methodology has always worked well for me
Hope this helps.