When you park a car it will be removed either by someone else using it, or when you leave the server. Parking is a RP action, and wrong parking could be handled in RP.
Spawning as car is setting the place where it appears every time it is destroyed or you log in. If this is in the middle of a busy road, this causes damage and anooyance to ther players.
You have two options.
1. Accept it when admins ask you something. If in doubt use the "Developers give examples" topic or write a mail.
2. Request a rule, which will be that all cars spawned in a place that hinders others will be removed from the player, without any refund of money.
Your choice.