Between us, I think it's actually good that this happens. Of course no one wants to forget about lucid dreams they had, but sometimes I practice so hard and when I don't get a lucid past some days, I think to myself:

" Maybe I indeed had a lucid in the last nights, I just don't remember it, must be that". And I work harder on my recall. I know it might sound silly, but the more positive you are about your skills, the more chances of having a lucid dream you got.