is this a problem?  people can buy kits with it, and become negative rp points?

Are you sure that's for the Server Rewards plugin? As far as I know, negative RP balances are not possible in Server Rewards but IS in Economics which is set by this variable:

 "Allow negative balance for accounts": false,

I have the same problem!!
Using RP, players can buy even w negative balance.

Helup!

Using RP, players can buy even w negative balance...
Started happening after yesterday's wipe.

Same.. I made kit and few people made 500.000 dept before i found out.
License have their own settings that prevents players to go negative balance, but Rust Kits doesn't.

I have the same problem too, players can buy kits with negative balance in RP. ¿Somebody knows how to fix?
Thanks.