The reputation system is in the very early days, so i guess it will change quite often in the next weeks, so dont worry too much...
With the two digit reputation it looks like they just display it now with two digits, but i have not looked into it if they changed something else also. Can it maybe be that you have gotten some downvotes and therefoe lost some reputation? Especially if you link / post not relevant content in their posts people get easily offended and flag you for that. Better to not do that...