Thats why I recommend just deleting all the default objects in the first round of forge. however, you can just leave the spawn points and weapons cause I found out that I always hit the item limit when I'm placing spawn points so I just use the original spawn points. I got so fed up with all these canvases with the original objects there. Those objects are basically useless! So.....I went and made my own OLN canvas with only the weapons, vehicles, and spwans. In fact, if you have the time, go and make your OWN canvas map, suited just for your own needs. But if you like, you can just use a pre-built canvas instead. Hope this helps.
Well you sound like you got it all figured out then. I had the exact same problem you are having- and most of the time it was with the default objects. Every now and again somehow- a newly spawned object would join the fray- but it wouldn't. Sometimes it would take 60, sometimes more- sometimes it would NEVER spawn at all. The point is- ANY default items on a map cause it to be pretty glitchy.