I'd say it's normal.  I also occasionally blank on primitives.  In those cases, I fail the card where I forgot the primitive, but pass ones that come later in the session with the same primitive (assuming I get them right.)  That way at least you get one card going through again with the trouble primitive.

To be honest the "made a mistake" option is one big reason why I decided to move to Anki.  There are times when I messed up primitive placement or remembered 4 out of 5 priminitives and it feels like a waste to completely reset them back to stack 1.

As far as recall rates ... that's a bit tricky since I've gotten really lazy at times where cards stacked up for 2 or 3 weeks.  I currently have an 83% recall rate for cards older than a month in Anki, but my guess it that would be closer to 90% if I didn't take long breaks.

It happens to me sometimes. When it does, for me, it's always one of two things.
One, it's always been a problem kanji for me. So I still forget it from time to time.
Two, and most frequent, it's a kanji similar in shape, meaning, or story to kanji I've recently learned, and it managed to become partially overwritten. After that, I take a moment to get them both straight in my head and don't usually have the problem again.. unless more kanji with the same meaning come up. This just reinforces the 'you don't really know one until you know them all' principle, I guess. For this reason, I imagine this problem will largely go away once I'm finished. Although of course I'll still be learning new kanji, albeit less, so I expect it to still crop up from time to time maybe.

Wizard wrote:

Sometimes I have bad days where I fail lots of cards I shouldn't, I usually just stop reviewing and come back to it later and it often solves the problem.

This happens to me too, some days stuff just doesn't want to click.

Well, I guess I just have to keep plugging away. Good to know it's not just me, though. Thanks guys.