The number of input & output records can be found in "Show run details" of flow setting - see screen-shot. There could be more output than input in a Flow run, depending on what happens in the Flow logic (for example, a SQL Lookup that returns multiple rows, or a Flattened List resulting in more Tuples).
The numbers are representative of total number of items that are actually input/output during flow run. For example, if a flow has 2 outputs that every input creates, then you would see twice as many outputs as inputs processed.