Fuel Depot not being supplied

The fuel depot is requsting a resupply but as soon as the truck has spawned to resupply the depot, the depot changes its status from 'awaiting incoming resupply' to 'not awaiting incoming resupply'causing the trucks to enter the secure zone and then just turn around and leave again.

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COLLECTED HARDWARE DATA
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Device
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Model: System Product Name (System manufacturer)

Operating system: Windows 10 (10.0.0) 64bit

RAM size: 32 GB

Battery status: Charging
Battery level: -1

Processor Device
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Type: Intel(R) Core(TM) i7-7700K CPU @ 4.20GHz
Core count: 8
Frequency: 4 GHz

Grahpics Device
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Vendor: NVIDIA
Type: NVIDIA GeForce GTX 1080 Ti
Memory Size: 11 GB

Screen Summary
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Full Screen: True
Resolution: 3440 x 1440 @ 100Hz