5k+ 404 pages & caching issue

Hi,

I switched successfully from “quick-pagepost-redirect-plugin” to your “Redirection” plugin. Thank you for your plugin!

I have 2 questions:

1) 404 pages:
I noticed I have more than 5000+ 404 pages. Most end with “img/anchor.gif”
Click here for a print screen.

I checked the FAQ regarding 404 of the “Redirection” plugin. But I am not sure how to deal with all 404 pages.
Could you advise me on this?

2) Caching issue
In the same time period, I installed the “Redirection plugin”, the cache of my Autoptmize plugin is filing up in one day. Click here for a print screen.
Could there be any relation?

Hope you can help me with these questions/ issues.

Kind regards,
Martijn