Why partly subscribe successful and partly unsuccessful?

1. My problem:

- I have a topic (name:**nlcloud-order-changed-event**) with many tags(such as : CREATED, **PAID**, REFUND_DONE).
Yesterday, I added some subscriptions and I found that **partly subscribe successful and partly unsuccessful**, I couldn't find the reason, thinks for help.

- Before yesterday, tag:PAID had 7 subscribe, it works, and i add 16 subscribe at this tag, this problem  appeared.(sometimes, it has 7 + 16 subscribe, sometimes it only have 7 subscribe)

2. My environment as follows:

- **What is your os?**
- linux 2.4 for x86_64

- **What is your golang version?**
go version go1.17.5

- **What is your client version?**
- rocketmq-client-go-version: v2.1.0

- **What is your RocketMQ version?**
- RocketMQ server: v4.9.2

3、Here are some logs