You use OnHammerHit hook for picking the vehicle up. 
CheckPickup then compares OwnerID with userID, and shows a "Pickup Ownership" error if it doesn't match.
The problem with that is that we aren't filtering out items that aren't the vehicles in your list. As a result, every thing you hit with a hammer or salvage hammer causes the "Pickup Ownership" error to occur. This means that if you hit turrets, or walls, or a barrel, then it does CheckPickup.

Suggestions:

1. Add a config so that,
2. You can add option to disable OnHammerHit altogether. There are other plugins that use this.
3. Maybe add option to offer other ways of picking up the vehicle, like a command.

good morning. 

As I wanted to post a similar issue, I rather reply here than making a new topic. 

As we have been using the plugin for a week now, we came across to some weird moments. let me share the things I found out. But, First of all, thank you for your support orange with these wonderful plugins. That there will be more in the future :D 

1. The plugin makes the ''mymini'' plugin even more enjoyable. Users are able to spawn one and then hitting on it so it becomes into their inventory. Great for when you would be in mid-air (a buddy of mine was playing with the hammer while mid-air with loot everything. you can suggest what happened haha )

2. When you dont have a TC placed, every hit should not trigger anything for me, but player B gets a load of spam when hitting my ents ( as explained by findles ) However, when ''invisable'' with vanish, every hit i do will become a ''owner error'' 

3. Hitting with the hammer will remove the ability to repair them. instead of repairing, they can be replaced with full health and low grade that was in it vanished. But for those who doenst have such privileges as they didn't have one from me ( as it was intended as a mini-event gift thingie ) are not able to repair them. Possible to give certain players an oxi group and assign it from there?  

4. hackable crate gets triggered with the error when hitting, plugin: DTD chest gets triggered, airdrops from plugin fancy airdrop get triggered in some weird occasions, haven't found the weird issue that could cause it yet but ill update this post ion case I can confirm some.