'How consistent is PHP hrtime()?

I'm currently using hrtime() in one of my project, a chat system (still in development stage).

On each message sent, I store the hrtime(true) value along with the message into database.

So recipient will request for new messages based on last message hrtime stored in app localStorage. like for example: select*from messages_table where message_hrtime>$last_hrtime and message_to=$me

It has been working alright until today, thrn I noticed new messages hrtime(true) value inserted into DB decreased which make new messages not to be received.

Notice the column message_hrtime decreased on id 35

And according to this article https://thephp.cc/articles/high-resolution-monotonic-timer, that hrtime() is ever increasing.

Now confused if the hrtime(true) is consistent.

PHP 7.3

php

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'How consistent is PHP hrtime()?

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