I also have this problem sometimes using Akregator Version 4.12.2 Using KDE Development Platform 4.12.2
One thing I notice is that the feed where it's wrongly saved to, is always the same.
Sometimes Feed A gets saved to Feed X Sometimes Feed B gets saved to Feed X Sometimes Feed C gets saved to Feed X
But I haven't noticed that other feeds are being messed up.
I also have this problem sometimes using
Akregator Version 4.12.2
Using KDE Development Platform 4.12.2
One thing I notice is that the feed where it's wrongly saved to, is always the same.
Sometimes Feed A gets saved to Feed X
Sometimes Feed B gets saved to Feed X
Sometimes Feed C gets saved to Feed X
But I haven't noticed that other feeds are being messed up.