iCal Issues- Dates and Events Being Changed

I transferred to iCal when I bought a Macbook Air about 3 months ago and it has been a bit of a disaster. It's annoying as I have iPhone/iPad and half of the point of buying the Macbook Air was compatibility between the calendars on all devices. The problem is that I alternate between using the "work" and "home" options and for some reason, if I put anything under the "work" option, it usually does one, or all of the following:

1.) Changes event from "Work" to "Home"

2.) In the case of multi day events (so, for example, a work trip spanning 3rd to 5th Feb), it reverts to just the first day (so the 3rd)

3.) In the case of time specific events (so, for example, a meeting at 14:30 on 3rd Feb), it reverts to being all day and deletes the time

Anyone got any ideas? It's driving me absolutely insane...