One situation that often arises with using jargon is as follows:

Experts use jargon when discussing a topic.

Non-experts or lesser-experts begin using the jargon without fully understanding it (occasionally perhaps without understanding it at all).

This alternative usage becomes widespread.

At first it's just wrong, but how many people have to adopt it before we consider it a legitimate alternative? (I have no idea.)

In conversation, non-experts use a term to communicate something with the expert, each thinking the communication has been clear (and maybe it has and maybe it has not).