I have attached a sample report demonstrating how to achieve the desired layout.
Note how the data is structured in the embedded CsvDataSource of the sample.
On the Graph:
The Categories are grouped by Hours - i.e. each Hour will be one Category (one X-axis slot/value).
The Series are grouped by 'group' ('services' or 'appointments') - i.e. 'services' will be one Series, and 'appointments' will be the second Series. Thus, in each Category slot there will be two bars - one for 'services' and one for 'appointments'.
Value (the number of services/appointments for the corresponding Hour) is represented on the Y axis.
In case the suggested approach does not help, you can open a support ticket and attach a runnable report for local investigation.
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