404 error links generating from JEM for J!5

https://mysite/calendar-view?modjemcal_id=141&modjemcal_id=141&modjemcal_month=10&modjemcal_year=2074
https://mysite/calendar-view/event/23?modjemcal_id=141&modjemcal_month=6&modjemcal_year=2050
How is this link generated? I do not have an event 23 it has been trashed a long time ago. 
How do I stop Jem from creating all these links. 
is there some way of turning it off? what am I not understanding.
I also dont have any  moduels with an id of 141.
Other than that it still works like a charm. I just have to sort out a lot of bad data to get to the real 404 errors and redirect them. 26 new l404 errors have been created since entering this post.

Exact JEM and Joomla version please!

And could you give more details where you find these URLs.
Or maybe you even can give us the URL of the website where it occurs (here or as PM).
 

Jommla 5.41Package:4.3.4August 2025 Component:4.3.4August 2025 Module-Basic:4.3.4August 2025 Module-Calendar:4.3.4August 2025 Module-Banner:4.3.4August 2025 Module-Jubilee:4.3.4August 2025 Module-Teaser:4.3.4August 2025 Module-Wide:4.3.4August 2025 Plugin-Content:4.3.4August 2025 Plugin-Content List Events:4.3.4August 2025 Plugin-Finder:4.3.4August 2025 Plugin-Search:4.3.4August 2025DisabledPlugin-Comments:4.3.4August 2025 Plugin-Mailer:4.3.4August 2025 PHP:8.3.28GD:2.3.3

I believe part of  the issue was a bad index containing links to deleted events/venues. 
Smart search index deleted and rebuilt stopped a few of the issues. 
Then I had to add these exclusions to the Joomla redirect plugin to stop it. 
last night I purged the redirect errors and this morning 10 hours later there were 10k in bad urls generated by JEM.
I removed the exclusion category-all. in ten minutes I have 20 bad urls from an event that I cant find in the administrator side or the database containing 141.
/category-all?filter_reset=1&id=1&modjemcal_id=141&modjemcal_month=4&modjemcal_year=2068&start=0&task=archive
/category-all?filter_reset=1&modjemcal_id=141&modjemcal_month=5&modjemcal_year=2018&start=0&task=archive
/category-all/event/23?modjemcal_id=141&modjemcal_id=141&modjemcal_month=10&modjemcal_year=2039
but with the exclusions in the redirect it stops this.

I am wanting to clean up urls and eventually want to use a rewrite to eliminate mysite/component/jem/event/199:port-st-lucie-seafood-festival the words component and the event id with : but I am still working on that.

The original post might not be areal issue but modjemcal_id=141 does not exist! I do not know where it is being called from.

The links are generated in joomla redirect plugin. the only component in mt installation is this one producing up to 50k in broken links if unfiltered. today there were only 240 links related to this link
/event-regions/category/ 

These links are part of the JEM calendar module. They point to the events for each day.

These links were published in your sitemap (or XML file) for your website map.
This XML is used by search engine crawlers to scan the web.

If these links were published and cached by third parties, and the events were later deleted, then when someone (a user or a bot) tries to access those links from outside, Joomla will detect them as 404 errors because they no longer exist. These 404s are then recorded in the redirect plugin for management or removal.

That’s all, they are traffic (request of URL old), you don't have any error in your Joomla or JEM. They will keep appearing because they are requests from third parties to your site, and they are not generated by Joomla or JEM, since the events no longer exist.

If the events no longer exist, you can delete the records (or entries).
You can modify your .htaccess file to drop these requests and update your sitemap/XML.