Due to our inability to be able to access the Game Panel, we were unable to test manual restarts and the restarts I was referring to were automated ones that happened at:
[2018-07-13 | 19:31:12] - vehicles respawned
[2018-07-13 | 15:36:35] - vehicles respawned
[2018-07-13 | 03:21:27] - vehicles respawned
[2018-07-12 | 15:06:22] - I believe this was the restart from the database shift.
From a database coder perspective, it looks like the server was not able to connect to the table or database that the vehicles are saved into, defaulting to fresh spawn vehicles. The thing that has me perplexed on the situation is that a manual restart of the server seems to have made it connect to the correct database, that is unless there has been a fix applied on the back-end.