At the pace the company is growing, they have had a hard time maintaining the level of talent and some of the newer staff have not taken the time to absorb the Credit Karma culture and way of doing things, and start making changes without understanding the effect of those changes.
If you are looking at taking a position at CK, then for the most part it should be a wonderful place to work. For the most part, it's the longer term employees who may be somewhat disgruntled due to all the changes. However, changes can be good...