Low speed on STAR

[F4b3l]

Hello everyone,

on a flight to EGLL i noticed that in profile mode the speed drops to 224kts before waypoint Logan on the Logan2H STAR. Prior reching Wesul speed increases again to 250kts and thereafter reducing again to 220kts prior reaching Lam. After studying the Charts i only found speed restrictions of 250kts at Wesul and 220kts at Lam.

Is there any reason to reduce speed so much before reaching Logan, just to accelerate at Wesul again?

I also tried to change the speed in the MCDU to 280/FL250. I could insert this speed behind the waypoint that it showed LOGAN xxxx 280/FL250, but nevertheless it still reduced to 224kts.

Well of course i can keep up speed manually, but i cant explain this behaviour and i´m not sure if this is a bug or a feature. I'am also using the navigraph navdata.