So we dont want to look at the first value, its the last value (which is what the single value will display), and the second to the last value( which is what the trend will be based on )
As somesoni2 mentioned what timespan the trend is based on would be configured by the trendInterval setting.
But as for the value being the same it makes sense based on the query. You are bucketing averages in 15 minute spans, so searching the past hour or the past 24 hours, the last 15 minutes span will be the same between the two queries.
Maybe we are not understanding what 2 timespan averages you are trying to compare.
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