Schedulling Problem in Primavera v6.7

Dear All,

I am facing a problem while scheduling in Primavera v6.7 as following:

1. The start date of a successor activity is same as the end date of the predecessor activity. 
2. The start time of some activities is 7:00am which is the start of the day as set in the assigned project calendar, however some activities are starting at 11:00 am or 2:00pm.
3. Total Float is coming not in whole numbers but in decimal figures.

Important thing to note is that I have set the Project Start time and the Calendar start time and the Schedule time same i.e., 7:00am but the problem still persists.

Can somebody help/advise me on this.

Thanks & Regards,

Faheem, PMP.

Project Planner