Searching Audit log Strange Behavior

Back in October, I created a script that dumps Daily Microsoft Stream Audit data into CSVs so that PowerBI Reports can be created. It was working fine until the 16th of December and now seems to be very inconsistently returning 1000s of duplicate records with a ResultIndex of -1. A correct return of data usually returns a ResultIndex going from 1 to however many records. Does anyone know why this may be occurring?

Do { 
	try{
        $currentResults = Search-UnifiedAuditLog -StartDate $startDate -EndDate $enddate -SessionId $sessionName -SessionCommand ReturnLargeSet -ResultSize 1000 -RecordType MicrosoftStream -Operations StreamCreateVideo,StreamEditVideo,StreamDeleteVideo,StreamInvokeVideoUpload,StreamInvokeVideoDownload,StreamEditVideoPermissions,StreamInvokeVideoView,StreamInvokeVideoShare,StreamInvokeVideoLike,StreamInvokeVideoUnLike,StreamCreateVideoComment,StreamDeleteVideoComment,StreamInvokeVideoTextTrackUpload,StreamInvokeVideoThumbnailUpload,StreamDeleteVideoThumbnail,StreamInvokeVideoMakePublic,StreamInvokeVideoMakePrivate,StreamCreateGroup,StreamEditGroup,StreamDeleteGroup,StreamEditGroupMemberships,StreamCreateChannel,StreamEditChannel,StreamDeleteChannel
    }catch [System.Exception] {
            $errorCount++
            $ErrorMessage = " Error: " + $_.Exception.Message 
            $logmsg = $ErrorMessage
            Write-Output $logmsg
            LogToFile -EntryType "ERROR" -Message $logmsg -Logfile $lgfile
    }
	if ($currentResults.Count -gt 0) {
        $logmsg = ("  Finished search #{1}, {2} records: {0} min" -f [math]::Round((New-TimeSpan -Start $scriptStart).TotalMinutes,4), $i, $currentResults.Count )
        Write-Output $logmsg
        LogToFile -EntryType "INFORMATION" -Message $logmsg -Logfile $lgfile
		# Accumulate the data
		$aggregateResults += $currentResults #Adds 1000 records at a time
		# if the results are below 1000 then its time to stop the loop
		if ($currentResults.Count -lt 1000) {
			$currentResults = @()
		} else {
			$i++
		}
	}
} Until ($currentResults.Count -eq 0) # --- End of Session Search Loop --- #