Advice: You need to provide more details, what it is crafting, and when (clicking a button, or automatically) and so on
And report it at best here, where DOlgubon created the feedback and error thread for the Writ Carfter console versions https://www.esoui.com/forums/showthread.php?t=11241
I have had dozens and dozens of writs set up to craft at a time. I go to a table, eg Blacksmithing, and as well as the writ items being crafted, I have a load of items in my inventory of purple quality, but they are not items that I have writs for.
I'll add this to the esoui forum post also.
If you're talking about master writs, I had this issue early on as well (on PS). I was able to determine that it was crafting yesterdays master writs along with the active master writs I had opened today. This was probably my fault though. At the time, I was crafting my master writs a day ahead of time so I could turn them in, open new ones, and craft those for turn in tomorrow. When I started just opening them, crafting them, and turning them in on the same day the issue resolved itself.
I do wonder, but didn't get around to testing, if the /rerunmasterwrits command would have resolved this if it was run after turning in the writs I had crafted yesterday.