Inconsistency in Tables - Mariadb Galera Cluster

MariaDB cluster Version : mysql Ver 15.1 Distrib 10.0.24-MariaDB,

I have a two node + arbitrator cluster which is live and replicating data across nodes.

Unfortunately we found some inconsistency in some of the tables in Databases.

For instance:

Node1:

MariaDB [(none)]> select count(*) from example_db.reports;
+----------+
| count(*) |
+----------+
|      299 |
+----------+
1 row in set (0.00 sec)

Node2:

MariaDB [(none)]> select count(*) from example_db.reports;
+----------+
| count(*) |
+----------+
|      285 |
+----------+
1 row in set (0.00 sec)

Note: Not find any noticeable errors in mysql error log

What could be the reasons for these kind of inconsistency ?

Is that a bug or a known issues ?

Thank you.