As it turns out, the Biblical Studies Carnivals this year had the correct numbers after all. Regrettably, the list on the Biblioblog Top 50 had skipped a number between March and April 2013. We were wrong. We have taken measures to help ensure that such an error does not recur (adding arabic numerals).
Thank you to Bob MacDonald for pointing out our error. You were right all along. The Carnival covering the June 2018 period was indeed the 148th Biblical Studies Carnival. The Biblioblog Top 50 therefore repents, in dust and ashes.
The Biblical Studies Carnival List has been updated accordingly.