why i have got same number of Jewel many many time.

[Kayleigh McMillan]

I have no idea either and i'm sorry to hear it worries you this much and gives you such inconvenience.
I have a full sim on which I breed as well but I never had such problems you mention.
I collect my gems in a sterling gem collector box freely available in the main store.
You think maybe saving them this way would stop the problem?