You could do one of the following to re-sync the events from the server. 
 i) Manually add another stanza in  etc\...\local\admon.conf  like so: 
  [newCollection]
targetDc = "your Server here"
startingNode = 
monitorSubtree = 1
disabled = 0
  
 ii) Use Splunkweb to add the new collection with the same settings as the old one. 
 iii) In the splunk directory, under  var\lib\splunk\persistentstorage\ADMon 
there is a file called "your collection name here.ini".
Deleting this file before restarting splunk-admon.exe will resync the data from the server. If there are multiple such files, pick the file pertaining to the collection you want to reenumerate. 
						
					
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