the plugin ruined all my attachments links

After I have installed the plugin and added two posts, it ruined all my other images.

The attachments have this url:
https://paper-backgrounds.com/yellow-ancient-wall-texture/yellow-ancient-wall-texture-hd/

but now they work only if I add /attachment/ in between

https://paper-backgrounds.com/yellow-ancient-wall-texture/attachment/yellow-ancient-wall-texture-hd/

I have deactivated the plugin, but all my other posts does not work anymore now.

https://www.ads-software.com/extend/plugins/faster-image-insert/