Why do my ears get blocked after meditation?

You must be having Vaayu or Vata dosha.
Don’t worry its not dosha as in Sin.

It is as per ayurveda, you could be having or defect of air in your body.
Hope you know about Pitta, Vata and Kapha body types in Ayurveda.
Two things, as per every person will fall under one of the body types.
So if you fall under Vata type body, then its okay.

Else you could be having Vata dosha due to improper breathing technique.
Offcourse there are reasons for Vata dosha or ear block feeling.

It can be like exposed to cold weather, always nervous or anxious, eating off time, sleeping not on time, always sleeping or exposed to under AC or Fan.
Else sedantary lifestyle also.

For now its nothing to worry.

If you are still in starting stage of meditation, i don’t think so it has any connection with meditation.

If you still want to be sure, meet a good yoga guru or a expert who is into meditation. Hope its not reached any complication level. Anyway its not a big problem, it looks like just some poor breathing technique or you temporary vata dosha or just that your body is Vata Dosha type.