Number of consumers get double at JMS queue level post successful ZDT

Dear Team,
Need help with respect to ZDT (Zero Down Time) patching. We are able to have successful ZDT patching but there is one issue. Post ZDT (after application redeploy) we observed numbers of consumer at JMS queue level gets double. We using MDB implementing javax.jms.MessageListener.
Before ZDT the number of consumers under Monitoring tab is 16 (default value) post ZDT, when manage server turn into Running state number of consumers get double to 32.
Now if we do ZDT patching again, the consumer count remain 32 and does not get double further.
If we start/stop manage server manually, consumer count reset to 16.