I don't have a definite answer,,, but can still speculate.
First ?? how many eggs are slightly cracked?
Possible reasons,,,
Your hens laid thin shelled eggs.:idunno
Eggs being in liquid for 7 months could have weakened shell. :idunno
Rinse egg,,, break it open and view how it looks. The...
I don't see the broken egg as contaminating the lime to make anything bad/ineffective solution. I would just leave as is,, and keep taking out eggs as you need them.
I know one person that does the lime preservation, but uses smaller vessels so egg count may be smaller than your. Many...