Error in Piwiks calculations (1 reply)

Hello!
I have noticed a strange thing: it seems Piwik can not count.

I have a web page published on March 7th.

I use the date range from 2014-02-20 to 2014-03-18. In the report Pages I find that my web page has had 297 pageviews and 272 unique pageviews.

I change the date range from 2014-03-01 to 2014-03-18. In the report Pages I find that my web page has had 53 pageviews and 50 unique pageviews.

There should not be any difference between these date ranges. Why is there a difference? My page wasn't published in February.
I have attached a picture showing you the difference (marked with red frames, and the date ranges are in green frames).

I then use the Row Evaluation. I have enclosed an attached file so you can see it. The Row Evaluation table shows the same data in both date ranges.
I can see the pageviews day after day. I move the mouse over each dot in the table and I can see I have the following pageviews: 59+4+2+103+60+35+15+19+21+32 = 350
According to the Row Evaluation table my page get a total of 350 pageviews.

So my page has 297 or 53 or 350 pageviews. Which number is the correct one???

I hope somebody can help me solve this mystery as I have no idea what numbers can be trusted. Please help and I'll be very grateful!
Thanks in advance!

Best regards,
E