Just chipping in to say, I have not had that experience with Createx. I have gone from one bottle to another in the same painting and colour has been spot on. I pretty much only use Wicked though, so can't comment on CI.
Not that this is leakys issue in this case, but for any newbs seeing this, and wondering about colour generally - pigment does tend to settle and become more concentrated at the bottom of a bottle, and then a new bottle can appear a different colour (in fact it is just less pigment to binder ratio and another layer or two will and it will match, as its the depth of tone rather than colour which was affected. Unless you are using trans paint which will just get darker and darker as more layers are added all the way up to black). So keeping your paint well mixed and shaken is important.