Pasting Excel Data into Microsoft Projet

I'm desperately trying to paste data from an excel file into a Microsoft Project plan. Microsoft Project always seems to do some sort of calculations which is overriding the real data. For example :

Excel Source Data :
    Start     |Actual Work|Remaining Work|Actual Duration|Remaining Dur|  Finish |
11/26/13  |           5           |           20               |           2                |              1            |11/28/13 |

Once inserted into Microsoft Projet Data
    Start     |Actual Work|Remaining Work|Actual Duration|Remaining Dur|  Finish |
11/26/13  |      18.33         |         6.67              |           2                |              1            |11/28/13|

Task type is currently set to Fixed Work but I tried all sorts of trickery (all task types / manual vs auto shceduling) and it always does the same thing.

How to make this work? I realize the 20h in a single day, this is just an example. Bottom line is I want Project to trust the data and not override anything.

Thanks