Hi rsrathnaraj,
This is a great question and it does come up from time to time. Performance reports show data on what keyword match type was used in a search query. However, the data does not necessarily show the match type on which you bid. For example, you bid on a keyword with a broad match and the search query matches it to an exact match. Even though you did not bid on an exact match, the report shows that the impression, click, or conversion was from an exact match, not a broad match.
Hope this helps with the 'strange' results in your data.
Thank you,
Brian H - MSFT