Subscribe by Email - Sends first batch twice

Hi,

We are using WP 3.81, Subscribe-by-Email 2.7.5

In the 'Sent Emails' I get Duplicate Dates and recipient no's. It looks like it initially fires twice.
ie
Date: Recipients no. Status
June 9, 2014 1:01 am 1898 Finished
June 9, 2014 1:01 am 1898 Finished

But in the wp_subscription tables:
Select * from wp_subscriptions_log_table

1 OACS Communicator: test 1 1401807601 1
2 OACS Communicator: A Ga-ga pit for HCS!; OCS students bring back the salmon; Welcoming Paint Strokes 1898 1402275709 1902
3 OACS Communicator: %title% 1898 1402275710 1902

select count(*) from wp_subscriptions_meta where meta_key = 'digest_sent_2';

count(*)

1897

select count(*) from wp_subscriptions_meta where meta_key = 'digest_sent_3';
count(*)

70

So the second digest is being sent to everyone, and the third is being set to the first batch of subscribers twice. The curious thing is that the third also has an odd title.

Any thoughts on this would be great.