PayPal is one of the leaders when it comes to transaction safety. The system uses 2FA and has secure encryption, so nobody can get into your transaction and steal your funds. However, the problem may lie in the system itself. Sometimes, PayPal blocks incoming transactions if the algorithm thinks they’re malicious in some way. Sometimes, the system blocks completely legitimate transactions by accident. If that happens to you, contact the support immediately, and you’ll be able to sort it out.