As I have none of your code and none of your input data - I will again have to do some guessing, so please do excuse me if I make some wrongful assumptions.
The label that says "Q3 - 2011
" probably represents a day in July. Let's say it represents the 15th of July. The data item in the chart's items source also represents some day, apparently very close to 15th of July but seems that is some day after this. So the label is there to mark the 15th but the input data is for the 16th. So the chart does not want to clip your data and this is why it seems that it is showing an extra quarter.
I think now the problem is obvious to you, too. To solve this you need to somehow synchronize the input data and the axis' step.
I have to guess your next question, too - "How do I do that?" - Well, there is no easy way - because of the nature of the axis(ticks need to be evenly distributed). You can try to manipulate your input data to fit the axis, but this would be a cumbersome workaround.
If this empty space at the end is not a huge problem I suggest you leave it as it is. If you insist on removing it - my suggestion to you would be to get back to "XCategory" and use the simple work-around that I suggested in my previous response.
Hope this helps.
the Telerik team
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