JSON List structure corruption

Hello, We have a list structure within JSON and it works well most of the times. However it is corrupt sometimes leading to failure of the whole object.

Expected structure should be
[] Items
{} 0
{} 1
{} 2
etc…

However it appears like
{}Items
{}0
{}1
{}2
etc…

This is not always reproducible but only sometimes. Whenever this happen whole java requester session not failing to commit to the server.

Any help would be appreciated!