Pool Swimming not accurate - V8.00

Hello, I have Fenix 5 with FW 8.0 . Today the watch counted 1700m but I only had 1500m. This is quite a big difference and I am not happy with that. I have followed all the instructions to swim correctly (I swim breaststroke), I did not change the style nor speed during the lap. Maybe Garmin development team should look into this a little closer - attached is a .FIT file of the swimming activity. Thank you