Event Receiver won't update

Hello,

I currently have a custom list with an ItemAdded event receiver.
I have updated the event receiver a few times and redeployed it to the list. (using update-spsolution, and even remove and add solution)

The problem that i currently have is when i manually add an item to the list the lastest version of the event receiver is run.
Yet when an item is created with a workflow (on a different list) an older version (which contains errors) is run.

recreating the workflow did not work for me.

Does anyone ever encountered this error, or has any idea where the old code might be stuck at?

Kind regards,

Dominique