Some on the management staff are better than others at giving positive feedback and making employees feel appreciated. Those who aren't as good won't intentionally make an employee feel negative. They just have a managerial style that's more focused on situational issues as they arise, however without the overall positive feedback necessary to make someone feel valued. This can lead to feeling isolated and that one is screwing up. If this happens, remember the overall team spirit and reach out to coworkers to help overcome this.
Currently, the company is growing and with it come some growing pains. In particular, there can be short periods of high stress due to increased workload as upper management works toward a resolution (i.e., hiring more employees or restructuring existing teams). Eventually, a resolution is implemented and workload balance is restored. But, during the high stress, it can be challenging to not want to jump ship.