lol I forgot to actually release the lock

src/main/java/JobServ/ProcessManager.java

@@ -225,7 +225,10 @@ class ProcessManager {
         ProcessController candidate = this.processMap.get(pid);
         if (candidate == null) {
             JobServServer.logger.write("Tried to release lock of process that doesnt exist!");
+            return;
         }
+
+        candidate.releaseLock();
     }
 
     /*