Request for an idiom (if any) or an expression that describes the following phenomenon

I've been doing some data mining experiments, and something really weird happened one hour ago in the experiment result, and just now something similarly weird happened again.

I'm trying to think of an idiomatic way to describe the phenomenon observed in my experiments as I have to prepare a report for my advisor. A commonly used Chinese idiom (i.e., 无独有偶 just in case you can read it) quickly and naturally came to my mind, and I looked for English translations of the idiom.

I've found the following translation (apparently not idiomatic at all):

It happens that there is a similar case; it is not unique, but has its counterpart.

Solution 1:

Google Translate translates 无独有偶 as "Coincidentally". You could say:

Just now something weird happened. Coincidentally, the same thing happened one hour ago.