Smarty

I have managed to identify the issue, it's also caching the users id, so what is being shown is correct, but not what was expected because it's the wrong users info, at least now I can see the issue, ...

"According to docs" the use of these parameters is discouraged.

Which is why I tried enclosing it in nocache tags like in the example, I have tried your suggestion and the function data ...

I think I have an answer to this.
If you don't want the output of your function cached, add a "nocache" flag.

F.e.{myfunction nocache}

Is that not just the same as I wrote i ...

I have taken over someones else work and having a problem with a registered plugin function still being cached when cacheable is set to false

its setup as follows:-

$template->registerPlugin& ...