The night times appear to be wrong?

Is the night time correct?

For my location (Milton Keynes, UK) on 22nd July it says:
00:00 - n/a and n/a - 00:00

For 23rd July it says:
00:00-01:15 and 01:05-00:00 - so 1:15 hours and -1:05 hrs!?! - No night the day before?

For 24th July it says:
00:00-01:36 and 00:45-00:00 - so 1:36 and -45 mins!?!

For 31st July it says:
00:00-02:24 and 23:56-00:00 - so 2:24 hrs and 4 minutes.

Which does not seem to be quite correct? Also not centred around midnight even allowing for British Summer Time (BST)!

What about the other times?

Thanks a great App!