bug: single upstream is referenced by multiple routes, load imbalance occurs

[pioneer-hash]

Current Behavior

一共10个节点，流量最多的节点和流量最少得节点差3倍以上

Expected Behavior

now

Error Logs

null

Steps to Reproduce

1.版本V2.14

Environment

• APISIX version (run apisix version):
• Operating system (run uname -a):
• OpenResty / Nginx version (run openresty -V or nginx -V):
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[Baoyuantop]

Hi @pioneer-hash, please provide your routing and upstream configuration information, along with your statistics and observation methods. The version of apisix you are using is outdated. Please test with the latest version.

[Baoyuantop]

If there is still a problem, please open it again.