Resources on claimed island not respawning

[eldeschene 0]

Hey not sure if anyone else is having the same issue.  We are on a claimed island in A9. The little boulder one.  We have a farm and a warehouse placed down and all of a sudden our resources aren't respawning.  We have the buildings basically in  the water to not be on top of the trees but they aren't coming back.  Any clue if this is a glitch or if we are to close?  Thanks.