If they did not have full decay timer then the rate of decay is quicker. The amount of building pieces/placeables should be at least 20 in order to reach full decay timer.
So this would explain the disappearance.
Additionally, if you only go around once a week to refresh, perhaps you should consider having less buildings. Each building has to have a purpose and used regularly as per ToC. You share the server with others and that means if you’re taking up unnecessary space it is preventing others from benefiting from that space.
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