Interesting 2021 1/4 gold eagle strikethrough progression, questions for the error guys
Recently going through 2021 1/4 eagles I came across the following coins. At first glance I thought I was sent some scratched coins but then looking further it was a strikethrough and I then found another strikethrough in the same place on another coin.
The first strikethrough looks like a ribbon people put on their car windows for various awarenesses like breast cancer, Army, Navy etc. turned on its side. The strikethrough impression looks dark.
The second one contains the ribbon, then adds an extension on to it. The ribbon is no longer dark but the extension is.
So question for the forum and the error guys, what do you think caused this and why does ribbon go from dark to no longer dark?
Images below and I have had the coins encapsulated in a dual coin holder.
Appreciate any thoughts!