You may notice that a run can show different lap averages across platforms (e.g., Garmin Connect compared to Stryd PowerCenter - see below). The difference between Stryd and Garmin Connect (or any other platform) can be due to how each platform calculates the averages for the duration of the lap.
Some platforms might use second-by-second data to calculate the averages, while others might use total distance divided by the moving time, which is what Stryd uses. The differences become more evident in the short intervals when there are few data points within the sample.
Other reasons for this difference could be that each platform interprets the start and end of a lap relative to a lap button press differently, and whether the platform in question is showing elapsed time averages rather than moving time averages.