A quick solution to your door strike is to gently tap the lip of the strike receiver with a hammer. Your goal is to gently turn the excessively long lip of the striker downwards so that it does not catch your arm as you walk by it. If you have a vice in your tool shop it will even be simpler as you can clamp the strike receiver on the vice and tap the lip inwards.
A more challenging solution would be to grind it down with a grinder. Just be careful not to trim too much off or the latch will strike the timber instead of the receiver.
Let me tag our experienced members @TedBear and @Brad for their recommendations.
If you need further assistance, please let us know.