Flower Spikes?

I just started a window garden which consists mostly of potted vegetables and orchids. The ones I have are all Dendrobium phalaenopsis since they are cheap and easy to tend to. I have obtained all my plants already with flower spikes so all I have to do is wait for them to bloom. Recently I've noticed some protrusions on a cane that already bloomed. I have never seen a flower spike emerging so I am curious as to what these little protrusions are and my guess is that they are flower spikes.

From what I have researched some canes may flower multiple times so maybe this is the case. Also, this cane is on the same pot with another larger cane that has 3 flower spikes which are simultaneously blooming.

I also have another plant on a different pot with a branched spike but I don't have any photo of it. Being new to orchid care makes me very curious about all these things. Are they normal?

 

Thank you. Good to know that everything is fine.