Detected Lightning strikes subsequently disappearing

[weatherman22]

We had a spell of thunder in Central Scotland on 3rd May and the Real Time Lightning page indicated the strikes near me, which tied in well with the sounds. However they soon disappeared off the display, and even selecting the -24hr option did not bring them back, though I can still see the earlier ones to the east before they reached here.

I've noticed this before, strikes that were picked up in real time but then disappeared from the -1h -24h and archive pages.