I have posted this question on OSM Help Forum but did not get any ideas on this. So I post it here to see if guys here can help me. Thanks in advance.
I downloaded the osm data from bbbike.org. Recently I have observed another strange thing is that I setup two layers in leaflet (both layers are rendered from the same data base with same data). When I switch between the two layers, the missing tiles are oddly different for the two layers.
Any idea on how this happens and what I should do to fix it? Thanks. I have attached screenshots and also uploaded a Youtube video https://youtu.be/vkp3JTbPepo that can visually show the problem. Thanks.